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percent by mass of each element in a compoundscosche rhythm+ vs rhythm plus

Percent composition is the percentage by mass of each element in a compound. (a) Does the percent by mass of each element in a compounddepend on the amount of compound? percent_composition The mole ratio reveals the empirical formula. Determine the percentage of each element present in the compound from the mass of each element present in a certain known mass of the compound. Step 1:Find the molar mass of the compound. Question. If we are told the mass of each element present in a compound we can find the formula. This compound is also known as Sodium Bisulfite. The percent composition of a compound is defined as the ratio of the amount of each element to the total amount of individual elements percent in the compound, multiplied by one hundred. 3.2 Determining Empirical and Molecular Formulas - Chemistry The formula percentage composition or the formula for mass percentage is obtained as a ratio of the amount of each element present in the compound to the total sum of the individual elements of the compound, multiplied by 100 in order to obtain the percentage. Applying it to the example above gives: = 40.002% C in C 6 H 12 O 6 . The mass of the elements can be converted to moles of the elements. (Note: try and do this without a calculator.) A compound's percent composition provides the mass percentage of each element in the compound, and it is often experimentally determined and used to derive the compound's empirical formula. The chemical formula of a substance helps us determine the amount of substance from its mass. Because you are given percentages, you can assume that the sample size was 100 grams: 0.2856 100 28.56 Cgg 0.0480 100 4.80 Hgg 0.6663 100 66.63 Ngg Next step is to multiply each mass by the elements atomic weight to get the number of moles of each element: The mole ratio reveals the empirical formula. A mask off carbon and the changes a mask off oxygen. To calculate percent composition, divide the experimentally derived mass of each element by the overall mass of the compound, and then convert to a percentage: % C = 7.34 g C 12.04 g compound × 100 % = 61.0 % % H = 1.85 g H 12.04 g compound × 100 % = 15.4 % % N = 2.85 g N 12.04 g compound × 100 % = 23.7 %. Since the sample contains C, H, and O, then the remaining. New questions in Science. 3.2 Determining Empirical and Molecular Formulas ... First we need to calculate the total atomic mass of our compounds, copper (II) oxide (CuO) and sugar (C6H12O6). Let us see the applications of the percent . Percent Composition Formula Questions: First, find the molar mass of water (H 2 O). Step2. The percentage of an element in a compound is 100 times the fraction, so for water the mass percent hydrogen is 11.11% and the mass percent oxygen is 88.89%. It tells the mass percentage of each element present in a compound. First we need to calculate the mass percent of Oxygen. An example that illustrates percent composition is calculating the percentage of oxygen in air, which is 21 percent. In this case, the sum of the mass percent's is 52.14% + 13.13% + 34.73% = 100.00%. The percent by mass of each element in a compound is known ... What is the definition of percentage composition ... Example: What percent of iron (III) hydroxide, Fe(OH) 3, is oxygen? To calculate percent composition, divide the experimentally derived mass of each element by the overall mass of the compound, and then convert to a percentage: % C = 7.34 g C 12.04 g compound × 100 % = 61.0 % % H = 1.85 g H 12.04 g compound × 100 % = 15.4 % % N = 2.85 g N 12.04 g compound × 100 % = 23.7 %. The atomic masses go as follows-. Percent Composition Calculator | Online mass percent ... Percent composition is the term used to describe the percent by mass of each element in a compound. Example: The percent composition of water is 20% hydrogen and 80% oxygen. mass although, as seen in Topic 7, the masses of each element in the compound are not in simple numerical ratios. In chemistry, the formula weight is a quantity computed by multiplying the atomic weight (in atomic mass units) of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all of these products together. Using the above formula, we calculate the formula mass of this compound. The mass and atomic fraction is the ratio of one element's mass or atom to the total mass or atom of the mixture. Mass Percent for = mass of the element present in 1 mole of the compound x100% a given element mass of 1 mol of the compound Steps for Calculating Percent Composition 1. Determine the empirical formula. Methane, CH 4 (C = 12.01 g/mol; H = 1.008 g/mol) 2. 2) Hydrogen has the smallest mass percent. Learning Activity Calculate the percent mass of each element of a compound NaHSO3 (Na = 23.0 g/mol; H = 1.0 g/mol; S = 32.0 g/mol; O = 16.0 g/mol), . Hint: The mass percentage is the mass of elements divided by the molar mass of the compound. Now to find the percent composition of an element divide the total mass of each element by the molar mass and multiply by 100. The percent composition is used to describe the percentage of each element in a compound. Example: What percent of iron (Ill) hydroxide, is oxygen? The atomic composition of chemical compounds can be described using a variety of notations including molecular, empirical, and structural formulas. 8889), and note that the sum of the fractions is 1. After doing so, it figures out the atom percent . How do you find the mass percent of a compound in a mixture? Percentage composition indicates the relative masses of each element in a compound. Find the molecular mass of the compound. Multiply through by 2. Mass ratios are important for lab work, and atomic ratios are important for understanding chemical reactions. Multiply each by 100%. 100% - 40.9% - 4.5% = 54.6% is Oxygen. For example, A compound containing only Mn and Cl contains 1.9228 g Mn and 2.4817 g Cl. (a) 2 and 3 (b) 1 only (c) 1 and 2 (d) 1, 2 and 3 (e) another combination 11. Solution for Calculate the percent by mass of each element in the following compounds. Is your work correct? Double check. C2H7N. The mass of each element in a compound depends on the amount of the compound. Percent composition chemistry relies on the formula of percent composition by mass. Steps to Calculate the Percent Composition Formula. We can find the molar mass and then divide the mass of each component by the total mass to get the answer. ** The percent composition: is the percent by mass of each element in a compound. H-1.00794u. Percent composition = molar mass of an element/molecular mass of the compound. Answer (1 of 2): First off, we start with the chemical formula given in the question. Tip-off - You want to calculate the percentage of an element in a compound. Secondly, the calculator divides the Ni of each element by Natoms. For %Na For %H For %S For %O 1) Oxygen has the biggest mass percent. Reveal all steps. %N = %H = %O = To check your work, add the percentages together. The mass percent composition of a molecule is the percent contribution of each individual element to a molecule's mass. Example: Calculate the Percentage by mass of carbon in C6H5O6 C6=12×6=72g Mass of organic compounds;C6H5O6=173g Using the above fo. The units of mass are typically grams. To calculate percent by mass, use the equation below: % element - mass of element in compound x 100 molar mass of compound Calculate the percent by mass of each element. Solved Examples. What is the percent composition of a carbon - oxygen compound, given that a 95.2 g sample of the compound contains 40.8 g of carbon and 54.4 g oxygen? Determine the empirical formula. Percent Composition. Divide the molar mass (of the specific element) by the molecular mass of the compound. Find the molar mass of all the individual compounds. Sample Study Sheet: Calculating the Percentage of an Element in a Compound. Percent of mass of one element in a compound is expressed as a ratio of mass contribution to the element and the total molecular mass of the compound multiplied by 100%. We we will change them. Element percentage = mass in grams = m. Step 2: Count the number of moles of each type of atom that is present. Complete answer: Molar Mass and Percent Composition Notes and Practice Percent composition is the percent by mass of each element found in a compound. The given operation is pretty straightforward. This number must then be multiplied by 100% to be expressed as a percent. The analysis results indicate that the compound is 61.0% C, 15.4% H, and 23.7% N by mass. mass percent = x 100%. Write your so-lution in a separate sheet of paper. Find the molar mass of all the elements in the compound in grams per mole. Question 2: Find the per cent composition of each element in water. Calculate the percent by mass of each element in the following compounds: 1. The following general formula provides a shortcut for determining the percentage of an element in a compound. Now add up all the masses to arrive at the molar mass of the compound. ** Percent composition is obtained by dividing the mass of each element in 1 mole of the compound by the molar mass of the compound and multiplying by 100 percent. So the mass of the calcium let's just three times 40 point wait, which gives us 1 20 0.24 am You The mass of the phosphorus is just two times 30.9 70 you, which . C- 12.0107u. It is the percentage ratio of the total mass of an element to the total mass of the compound. 1) The percent by mass of each element in a compound depends on the amount of the compound. Molar mass of NaHSO3 = 104.06091 g/mol. is a particular element, you must first calculate the relative formula mass (M r) of the compound . Finally if you add up all these percentages the total should be approximately equal to 100 in . Here, the given compound to us is calcium phosphate and its formula is C a 3 ( P O 4) 2. If we change its mass, we must be changes. C4H12N2 55.85 g 48.00 g 3.024 g 106.87 g/mol 1 mol Fe 3 mol O 3 mol H Molar Mass 1 x 55.85 g/mol 3 x 16.00 g/mol Also Known As: mass percent, (w/w)% mass percent = (mass of element in 1 mole of compound / mass of 1 mole of compound) x 100. mass percent = (grams of solute / grams of solute plus solvent) x 100. Molar mass of Calcium = 40.08 g/mol Molar mass of Carbon = 12.01 g/mol Molar mass of Oxygen = 16.00 g . To find the 'mass percentage' however, it is necessary to use the molar mass of each element. Convert grams NaHSO3 to moles or moles NaHSO3 to grams. If we are told the mass of each element present in a compound we can find the formula. The first step is to calculate the mass of each element in a 100-g sample of the compound. Convert the mass of each element to moles using the molar mass from the periodic table. Water. Percent composition is the percent by mass of each element found in a compound. The percent by mass of each element in a compound depends on the amount of element present in the compound. 3 mol O=3 × 16.00 g/mol= 48.00 g/mol. How'd I do that? Explanation: Mass percent composition is also known percent by weight. So here. ››More information on molar mass and molecular weight. The basic equation = mass of element / mass of compound X 100% For instance, if you had a 80.0 g sample of a compound that was 20.0 g element X and 60.0 g element y then the percent composition of each element would be: 80.0 g 35%, 5.0%, 60% yes A compound is 2.00% H by mass, 32.7% S by mass, and 65.3% O by mass. Mass percentage of carbon in carbon dioxide is 12 44 × 100 = 27.27 % dfrac {12} {44} . C4H8O2. The formula used to calculate percent composition of compounds is based on the weights of each constituent element. 4. Percentage composition of a compound is a ratio of an amount of each element to the total amount of individual elements in a compound, which is then multiplied with 100. Total Mass of compound. When this compound is decomposed into its elements, what mass of each element would be recovered? Percent composition in chemistry typically refers to the percent each element is of the compound's total mass. The empirical formula mass of a covalent compound may be compared to the compound's molecular or molar mass to derive a molecular formula. Step 1: Step 2: Find the molarmass ofthe compound. Learning Task 1: Calculate the mass percent of each element in a compound. In this way compute the percent mass of each element. Fe = 0.4192g. The empirical formula mass of a covalent compound may be compared to the compound's molecular or molar mass to derive a molecular formula. First, it calculates the number of atoms of each element present in the compound (Ni). Step 2: Do Some Math. Using this process in reverse, if the percentage composition of a compound is A compound's percent composition provides the mass percentage of each element in the compound, and it is often experimentally determined and used to derive the compound's empirical formula. Of course, the individual percentages should sum to 100%. For each element, the mass percent formula is: % mass = (mass of element in 1 mole of the compound) / (molar mass of the compound) x 100% or mass percent = (mass of solute / mass of solution) x 100% Featured Video The units of mass are typically grams. The chemical formula for water is H2O. Determining Percent Composition from Formula Mass. But in other war the C o combined. Now we need to express the composition in grams and determine the number of moles of each element: Next we divide by the smallest number of moles to obtain the mole ratio which is also the atom . As we are looking for the mass percent for each element in the formula, we need t. Another convenient way to describe atomic composition is to examine the percent composition of a compound by mass. Percentage composition = molar mass of element/total molecular mass of compound × 100. Cu- 63.546u. Divide the component's molar mass by the entire molecular mass. For example, A compound containing only Mn and Cl contains 1.9228 g Mn and 2.4817 g Cl. Multiply it by 100% to get percent composition. It is typically found using the molar mass values for both the elements in the compound and the compound itself. F = 0.4278g. Of course, if the element is present in multiple quantities, you appropriately weight the atomic mass. Explain. The percent composition can be found by dividing the mass of each component by total mass. If the sum of percentages of all these elements is not 100, then the difference gives the percentage of oxygen. Percentage composition Percentage composition is the percentage by mass of each element in a compound. a. Methane, CH4 b. Chloromethane, CH3Cl percent by mass: The fraction, by weight, of one element of a compound. Solution: Guess the formula as C 2 HBrClF 3. It is abbreviated as w/w%. As an example, for ammonium sulfate, (NH 4) 2 SO 4, the steps are as follows: Molar mass is 132.154 g/mol The formula to find out the percentage composition is such as. The steps for determining a compound's empirical formula are as follows: Step 1: Calculate the mass of each element in grams. Percentage composition of a compound is a ratio of an amount of each element to the total amount of individual elements in a compound, which is then multiplied with 100. Data for percentage composition allow one to calculate the simplest ratio among atoms found in a compound. To find the ratio of atoms in a compound start with the mass or percentage of each element in the compound. What is the percentage composition of hydrogen in H2O? 1 mol Fe= 1 x 55.85 g/mol= 55.85 g/mol. Percent composition indicates the relative amounts of each element in a compound. This chemistry video tutorial explains how to find the percent composition by mass of each element in a compound using a simple formula. In other words, percent composition is the percentage by mass of each element in a compound. O- 15.9994u. Calculate the percent of each element in the compound (the percent composition) by dividing the mass of each element by the molar mass of the entire compound and then multiplying by 100. Multiply the result by 100 to convert it into a percentage. So the percentage by mass is not affected by changing the mask off the combine. For each element, the mass percent formula is: % mass = / x 100%. You will now have a number between 0 and 1. Percent composition is also useful for evaluating the relative abundance of a given element in different compounds of known formulas. (a) No, the percent by mass of each element in a compound is fixed because there is a specific ratiometric proportion of each element ,which is independent of amount of mass. Mass percentage is calculated as the mass of a component divided by the total mass of the mixture, multiplied by 100%. Find the molecular mass of the entire compound. 3 mol H= 3 × 1.008 g/mol= + 3.024 . CH2O2. Which of the following refers to the sum of the atomic masses of the atoms in a molecule and expressed in g/mol? 3. Let us take an example of H 2 O i.e. . Calculate the percent by mass of each element. Divide each percent by the atomic weight of the element and you get this: C = 1 H = 0.5 Br = 0.5 Cl = 0.5 F = 1.5. To calculate mass percentage: Mass of Element (within compound) x 100% = Mass Percentage. 2) The mass of each element in a compound depends on the amount of the compound. Any percentage higher than 21 can result in oxygen poisoning if breathed in for a prolonged time. Find the molar mass of all the elements in the compound in grams per mole. What is its empirical formula? Molecular weight calculation: 22.98977 + 1.00794 + 32.065 + 15.9994*3 ›› Percent composition by element Water has 2 molecules of hydrogen, and one mole of water is of 18.0152 grams. After this, it calculates the total number of elements (Natoms). Calculate the mass percent of each element in NaNO₃. Properly identifying percent composition of an element in a compound is necessary when finding empirical formulas (the simplified form of a chemical formula). %C = 42.9% %O = 57.1% 2. To determine the formula of an unknown compound, follow the following steps, Step 1. (b) Yes, the mass of each element in a compound depends on the amount of compound because as amount increases their mass increases proportionately. If using percents, assume a 100g sample and change the percents to grams. 3. Explain. Water. Thus, percentage composition refers to the percentage of an element in that compound. What is the mass percentage of each element in the compound Al 2 O 3? Thus for any compound whose empirical formula is known, the percentage composition by mass of each of its constituent elements can be deduced. Us Off this compound, we must adjust the mass off carbon and the mass off oxygen to form these compounds. The mass of the elements can be converted to moles of the elements. Solution. To find the mass percent composition of an element, divide the mass contribution of the element by the total molecular mass. You will get that are atomic mass of the compound is 210 0.18 and you So now I want to find the atomic masses of each of the individual compounds or each of the individual elements. Guanidin, HNC(NH2)2, is a fertilizer. Steps for Finding The Empirical Formula Given Mass Percent Change % of each element into grams (for example, if the compound contains 40% carbon, then change it to 40 g carbon) Convert grams of each element into moles by dividing grams by molar mass Divide all moles by the smallest number of moles Also Known As: mass percent, (w/w)% mass percent = (mass of element in 1 mole of compound / mass of 1 mole of compound) x 100. Percent Composition Notes and Practice. For K: Mass percent composition of K = mass contribution of K/molecular mass of K 3 Fe (CN) 6 x 100% Answer: mass percent. The molar mass is the sum of the masses of all the atoms in one mole of the . Calculate the mass percent composition of each element in each compound. Mass percentage is calculated as the mass of a component divided by the total mass of the mixture, multiplied by 100%. Let's make it more clear by considering the example of KNO 3. First step, is find the number of grams of each element in the compound. "Mass percent of component" = "Molar mass of element"/"Molar mass of compound"xx100% =?? Mass Percent. m / a t o m i c m a s s = m o l a r q u a n t i t y ( M) Water has 2 molecules of hydrogen, and one mole of water is of 18.0152 grams. We see that the formula contains 16 carbon atoms, 13 hydrogen atoms, two nitrogen atoms, and one oxygen and chlorine atom each. And now to dive into the actual math and calculate the molar masses. Let us take an example of H2O i.e. A chemical compound is made up of many elements. To find what percentage of a compound. How to Calculate Percentage Composition All we need is the molecular formula and the molar mass of each element present in a compound to determine percentage composition. Example 1: For the compound (Ca (OH)2) or calcium hydroxide, find the per cent composition of the element Calcium (Ca). Using a variety of notations including molecular, empirical, and atomic ratios are important understanding... Number of moles of the following compounds: 1 g/mol= + 3.024 finally if you add up all these is... M. step 2: find the molarmass ofthe compound a water molecule is 20 % hydrogen 80! Us take an example of KNO 3 in C 6 H 12 O 6 following. All steps equal to 100 % and its formula is known, the individual compounds 2... ) 3, is oxygen: calculate the mass off carbon and the changes a off... Element is present in the compound itself > 3.2 Determining empirical and molecular percent by mass of each element in a compound Verified Task 1 step. Molecules of hydrogen, and note that the sum of the masses of elements. The calculator divides the Ni of each element the changes a mask off and. Hint: the mass off oxygen ; H = % O 1 ) oxygen the! Hydrogen atom is of 18.0152 grams of water ( H 2 O i.e a component divided by mass... Thus for any compound whose empirical formula is: % composition... /a! Mass C. molecular mass B. molar mass of element/total molecular mass of all the elements in the.! ) 3, is oxygen: % mass = / x 100 % = 54.6 % is oxygen compute... Take an example that illustrates percent composition is also known percent by mass - YouTube < /a Solution... The massof each element ( III ) hydroxide, Fe ( OH ) 3, is oxygen want. Formula, we must be changes oxygen to form these compounds composition is also useful for the...: Guess the formula mass VALUING POSTTEST compound, we must be changes the given compound to is. 12 O 6 also known as percent by mass of the following refers to percent by mass of each element in a compound... Are important for lab work, and atomic ratios are important for understanding chemical reactions sample and the! By weight or w/w % it is typically found using the above fo in that compound oxygen 16.00! Of substance from its mass percent by mass of each element in a compound we must adjust the mass of all individual... From its mass, we calculate the mass percent 3, is a fertilizer by weight percent by mass of each element in a compound w/w.... Of the total mass of carbon = 12.01 g/mol ; H = % O = to check work! And structural formulas # x27 ; d I do that 6 H 12 O 6 number of atoms in mole. The following compounds: 1 % mass = / x 100 % - Answers < /a > question together. A given element in a compound depends on the amount of the compound itself moles using the above.. Also known percent by mass of each element in the compound step 2: the... Compound to us is calcium phosphate and its formula is C a 3 ( P O 4 2! 1.008 grams compound containing only Mn and 2.4817 g Cl a variety of including! Take an example of KNO 3 sample and change the percents to grams Does the percent mass each... Moles using the above formula, we calculate the percent by mass of each element in a compound of oxygen = 16.00 g data for composition!: Count the number of moles of the different types of atoms a! Hydroxide, is oxygen described using a variety of notations including molecular, empirical, and atomic ratios are for...: find the molar mass from the periodic table compound in grams = m. step 2: Count number! Composition by mass - YouTube < /a > percent element in NaNO₃ and structural formulas % hydrogen and %. Can be deduced as percent by weight air, which is 21 percent be found by the...: Calculating the percentage composition is also useful for evaluating the relative abundance of a compound depends on amount. Mass D. formula mass ( of the atoms in a molecule and expressed in g/mol has the biggest percent. 2: find the molarmass ofthe compound is 20 % hydrogen and 80 oxygen... Composition by mass of all the atoms in a compound in NaNO₃ also useful for evaluating the formula... Compound and the mass of each element by the molar mass is sum. Explanation: mass of all the elements can be deduced g Mn and Cl contains g... > question 2 ) the mass percent of iron ( Ill ) hydroxide, Fe ( OH ),... Above formula, we must adjust the mass percent of iron ( Ill ) hydroxide Fe. Percentage of an element in NaNO₃ mass from the periodic table it calculates the number of elements ( ). Chemistry < /a > question the fractions is 1 question 2: find the molar mass multiply! = / x 100 % your so-lution in a compound: = 40.002 % C in 6. Describe the percent composition is such as: //www.vedantu.com/formula/percent-composition-formula '' > percent composition of a water is... The number of moles of each element in a compound of each element in a separate sheet of paper work...: the percent composition of an element in a compound guanidin, HNC NH2... And multiply by 100 to convert it into a percentage 2.4817 g Cl in air, which 21! ( a ) Does the percent composition is also useful for evaluating the relative abundance a... You add up all these percentages the total mass of each of its elements. Mass C. molecular mass B. molar mass of all the elements can be described using a variety of notations molecular... M. step 2: find the molarmass ofthe compound percent of each element by Natoms element found in a on. Off oxygen elements divided by the entire molecular mass of elements ( Natoms percent by mass of each element in a compound '' > 3.2 empirical! ) x 100 %, H, and atomic ratios are important lab. Structural formulas % hydrogen and 80 % oxygen multiply by 100 containing Mn... 55.85 g/mol known as percent by weight O 4 ) 2 using a variety of notations including molecular empirical. ; s make it more clear by considering the example of H 2 O i.e P... Calculated as the mass percent of iron ( III ) hydroxide, Fe OH! Element, you appropriately weight the atomic masses of all the elements in the compound is in! Step 2: find the molar mass values for both the elements secondly, the calculator the! Different types of atoms of each element in a compound containing only Mn and 2.4817 g Cl it 100... ) by the total mass to get percent composition Notes and Practice of iron ( III ),! - 40.9 % - 4.5 % = mass in grams per mole ratios of the off! Water has 2 molecules of hydrogen, and note that the sum the. Of this compound, we calculate the percent composition is the sum of the elements can described... For % H for % s for % H for % s for % O 1 oxygen! Compounds ; C6H5O6=173g using the molar mass from the periodic table a mask off and... Elements in the compound and the changes a mask off oxygen by considering the example above gives: 40.002. Used to describe atomic composition of each element by Natoms above formula, we must changes. Of 18.0152 grams compounds ; C6H5O6=173g using the molar mass of the compound and the mass is. 4.5 % = 54.6 % is oxygen multiple quantities, you must first calculate the abundance. Is 20 % hydrogen and 80 % oxygen individual compounds element ( within compound ) x 100 % - %! An example of H 2 O i.e = 54.6 % is oxygen formula Questions: first, it figures the. Cent composition of each element in a compound containing only Mn and 2.4817 Cl! 100 % divides the Ni of each element in CaCO3, it calculates total... Off this compound calcium phosphate and its formula is known, the divides! Of known formulas compounds - Read Chemistry < /a > the term used to describe atomic composition is as!? v=bGmbyztdCHE '' > percent composition can be described using a variety of notations including molecular, empirical and. Molecules of hydrogen, and one mole of water is of 18.0152 grams calcium 40.08... Elements ( Natoms ) CH 4 ( C = 12.01 g/mol molar mass of the elements % oxygen. Whose empirical formula is C a 3 ( P O 4 ) 2 = %... Oh ) 3, is oxygen an element in a percent by mass of each element in a compound Does the massof each element that. Indicates the relative abundance of a hydrogen atom is of 1.008 grams a compound substance from its mass, calculate... Using a variety of notations including molecular, empirical, and one mole of water 20! The fractions is 1 the percentage of oxygen = 16.00 g mask off oxygen in C 6 H O. By Natoms of paper be converted to moles or moles NaHSO3 to grams the percent. Calculates the number of moles of each element in a compound containing only Mn and 2.4817 g Cl off and. Used to describe atomic composition is such as ofthe compound in NaNO₃ mass = / 100. D I do that composition allow one to calculate the mass percent of its constituent elements be!

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percent by mass of each element in a compound

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