Become a member and unlock all Study Answers Browse the list of We determine the percent by mass of water in the compound by dividing the mass of water by the total mass. Chemistry, 21.06.2019 21:00, Gghbhgy4809. Mass of Na = 23 Mass of S = 32 Mass of O = 16 Therefore, molecular mass of Na2SO4 = (23 * 2)+32+ (16 * 4) = 46+32+64 =142 Note that rounding errors may occur, so always check the results. Please!! 5.59% 11.26% 44.08% 55.92% Answers ( 1 ) Gregor 17 November, 04:34 (a) Mass % of Na2SO4 = mass of Na2SO4/total mass of soln x100 = 10.6g/ (10.6 + 483) g x100 = 2.147% 2 | … Na2SO4 = 142.04 g/mol. sodium sulfate has the formula NA2SO4. Answers ( 1 ) Gregor 17 November, 04:34 Molar mass of Na2SO4 = [(2 × 23.0) + (32.066) + 4 (16.00)] = 142.066 g Mass percent of an element Can someone please check my work against what you come up with? What is the percent-by-mass, %(m/m), concentration of Na2SO4 in a solution made by dissolving 35.2 g of Na SO, in enough water to give 96.0 g of total solution? Its density is 1.0350 g mL-1. ----- mol L-1 Calculate the mass percent of Na2SO4 in the solution. The percent by mass of water in Na 2 2 SO 4 4 x 10H 2 2 O is 55.91%. b) how many grams of this compound contain 2.00grams sulfur. With an annual production of 6 million tonnes, the decahydrate is a major commodity chemical product. &= \rm \frac{10.8\ g}{495.8\ g}\times 100\%\\ The formula weight is simply the weight in atomic mass units of all the atoms in a given formula. Earn Transferable Credit & Get your Degree, Get access to this video and our entire Q&A library. Express the concentration of 0.0400 M aqueous... Air is a mixture of several gases. An aqueous solution of Na2SO4 has a molal concentration of 0.293 mol kg-1. Convert grams Na2SO4 to moles  or  moles Na2SO4 to grams, Molecular weight calculation: Molar mass = atomic mass of Na (23) + atomic mass of S (32.066) + atomic mass of O (16) Molar mass of (Na 2 SO 4) = [ (2 × 23.0) + (32.066) + 4 (16.00)] = 142.066 Mass percent of an element To complete this calculation, you have to know what substance you are trying to convert. calculating percentage mass of an element in a compound worksheet: how to calculate mass volume percent: percent composition empirical and molecular formulas worksheet: calculate the mass percent of na2so4: determine the percent composition by mass of oxygen in the compound c6h12o6: how to find the percentage of an element in a compound {/eq}. Elemento ... Hill formula, elemental composition, mass percent composition, atomic percent compositions and allows to convert from weight to number of moles and vice versa. The percentage by mass of a solute (the "stuff" that is dissolved) equals the mass of the solute divided by the total mass of the solution i.e. Molecular weight calculation: 22.98977*2 + 32.065 + 15.9994*4 ›› Percent composition by element 13.39 (a) Calculate the mass percentage of Na2SO4 in a solution containing 10.6g of NaSO4 in 483 of water. 0. Calculate the molecular mass (MM): MM = (2 x 22.99) + 32.06 + (4 x 16.00) = 142.04 The 10 most... 3. This compound is also known as Sodium Sulfate. the mass of the solvent (the substance in which the solute dissolves) and the solute. (a) Calculate the mass percentage of Na2SO4 in a solution containing 10.6 g of Na2SO4 in 483 g of water. It is 30% off... What is the % by mass of a solution created with... What is the mass percent of concentrated aqueous... 3. Use mc003-1.jpg. {/eq} . Calculating the Molar Mass Of Na2SO4: = [(2 x 23.0) + (32.066) + 4(16.00)] = 142.066 g. Formula Used To Find The Mass Percent Of An Element: This site explains how to find molar mass. (b) An ore contains 2.86 g of silver per ton … The mass and atomic fraction is the ratio of one element's mass or atom to the total mass or atom of the mixture. Sodium Sulfate Anhydrous is the anhydrous, sodium salt form of sulfuric acid.Sodium sulfate anhydrous disassociates in water to provide sodium ions and sulfate ions. Find an answer to your question “What is the percent by mass of water in Na2SO4 x 10H2O ...” in Chemistry if the answers seem to be not correct or there’s no answer. 13.39 (a) Calculate the mass percentage of Na2SO4 in a solution containing 10.6g of NaSO4 in 483 of water. asked Jan 20, 2020 in Chemistry by SurajKumar ( 66.2k points) some basic concepts of chemistry :) I've tried two different formulas: 1) 13.0 x 100 = 1300/427 = 3.044 2) 13.0 x 100 = 1300/414 = 3.104 The program … All forms are white solids that are highly soluble in water. The Na2SO4 was determined to be the limiting reactant. We use the most common isotopes. Mass percent of Na, S and O in the given compound. Mass of mixture 1.030g Mass of precipitate 0.326g Percentage by mass… {/eq} . chemistry The reason is that the molar mass of the substance affects the conversion. These relative weights computed from the chemical equation are sometimes called equation weights. Our experts can answer your tough homework and study questions. This compound is also known as Sodium Sulfate. a) what is the mass percentage of each element in sodium sulfate? Molar mass of Na2SO4 = 142.04214 g/mol. Multiply the masses by the mole ratio. When calculating molecular weight of a chemical compound, it tells us how many grams are in one mole of that substance. Solution for (a) Calculate the mass percentage of Na2SO4 in a solutioncontaining 10.6 g of Na2SO4 in 483 g of water. Its density is 1.0350 g mL-1. For bulk stoichiometric calculations, we are usually determining molar mass, which may also be called standard atomic weight or average atomic mass. What pressure will be exerted by 0.675 moles of a gas at 25*c if it is in a 0.750-l container? Sodium ion is the principal cation of the extracellular fluid and plays a large part in the therapy of fluid and electrolyte disturbances. Well, I don't think the question has any hard crack, cause we are finding the whole composition for the element it self. So: 142.04 g/mol x 0.35 = 49.7 g. Water = 18 g/mol. Question: What Is The Mass Percentage (mass %) Of Na2SO4 In A Solution Prepared By Dissolving 10.0 G Of Na2SO4 In 250.0 G Of Water? Molecular mass (molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u). Q-2 Calculate the mass per cent of different elements present in sodium sulphate (Na2SO4). The following lesson provides the formula, examples of when the coefficient is used, its significance, and a quiz to assess your knowledge of the topic. using your results, calculate the mass percent of each reactant (BaCl2•2H2O and Na2SO4) found in your initial mixture. n H 2 O undergoes 56% loss in weight on heating and becomes anhydrous. ----- How to work out , i cant figure it out NY Regents Exam - Integrated Algebra: Test Prep & Practice, Praxis Mathematics - Content Knowledge (5161): Practice & Study Guide, SAT Subject Test Mathematics Level 2: Practice and Study Guide, NY Regents Exam - Geometry: Test Prep & Practice, High School Algebra II: Tutoring Solution, High School Trigonometry: Homeschool Curriculum, Glencoe Pre-Algebra: Online Textbook Help, GACE Mathematics (522): Practice & Study Guide, Ohio Assessments for Educators - Mathematics (027): Practice & Study Guide, NMTA Mathematics (304): Practice & Study Guide, Biological and Biomedical Given Element: Na2SO4. Sodium ion is the principal cation of the extracellular fluid and plays a large part in the therapy of fluid and electrolyte disturbances. Massa molar of Na2SO4*5H2O is 232.1185 g/mol Convert between Na2SO4*5H2O weight and moles. A common request on this site is to convert grams to moles. ›› Na2SO4 molecular weight. Sciences, Culinary Arts and Personal Answer The molecular formula of sodium sulphate is . This is how to calculate molar mass (average molecular weight), which is based on isotropically weighted averages. Identify how many moles (mole ratio) of each element are in … The total mass of Na2SO4.10H2O is equal to 322 g. The mass of water is 180 g. percent by mass of water = (180 / 322) * (100 %) = 55.9% Answers: 2 Get = Other questions on the subject: Chemistry. (Na2SO4 = 142.04 G/mol) Group Of Answer Choices 3.85 % 13.53 % 96.15 % 4.00 % 0.14 % Calculate the mass percentage of Na2SO4 in a solution containing 13.0 g Na2SO4 in 414 g water. The atomic weights used on this site come from NIST, the National Institute of Standards and Technology. What is the mass percent concentration of a saline solution prepared by dissolving 1.00 mol of Na2SO4 in 1.00 L of water? Answers (1) Aniya Haney 17 February, 02:40. (b) An ore contains 2.86 g of silver per ton… ----- mol L-1 Calculate the mass percent of Na2SO4 in the solution. sodium sulfate has the formula NA2SO4. Learn how understanding and being able to calculate percentages can help you when shopping and when reading test scores. calculating percentage mass of an element in a compound worksheet: how to calculate mass volume percent: percent composition empirical and molecular formulas worksheet: calculate the mass percent of na2so4: determine the percent composition by mass of oxygen in the compound c6h12o6: how to find the percentage of an element in a compound Weights of atoms and isotopes are from NIST article. a.) common chemical compounds. An aqueous solution of Na2SO4 has a molal concentration of 0.293 mol kg-1. The molecular formula of sodium sulphate is (Na 2 SO 4). Finding molar mass starts with units of grams per mole (g/mol). The percentage (by mass) concentration of a solution obtained by mixing 3 0 0 g of a 2 5 % (solution I) and 4 0 0 g of a 4 0 % (solution I I) by mass is (as the nearest integer): View solution The hydrated salt, N a 2 S O 4 . Answer to Calculate the mass/volume percent (m/v) for the solute in each of the following solutions:a. Hi, I have worked this question as I thought it goes, but it comes up wrong when imputing it in my HW. All rights reserved. The Pearson correlation coefficient is just one of many types of coefficients in the field of statistics. Suppose consumers buy 40 million packs of... How many grams of salt are needed to make 713g of... A sweater is on sale for $43.75. of a chemical compound, More information on Finding molar mass starts with units of grams per mole (g/mol). A university begins Year 1 with 80 faculty.... A 45.0 g aqueous solution is made using 10.0 g of... An iron ore sample is analyzed for iron content by... How do you subtract whole numbers from... How do you subtract a percentage from a whole... Pearson Correlation Coefficient: Formula, Example & Significance. &,\color{blue}{\approx \boxed{21.8\ \%}} Type answer How many grams of glucose (C6H1206) are there in 911.47 mL of a 15.63 %(m/v) glucose-water solution? Composto: Mols: Massa, g: Na2SO4*5H2O: Composição elementar de Na2SO4*5H2O. The percent composition can be found by dividing the mass of each component by total mass. How to solve: Calculate the mass percentage of Na2SO4 in a solution containing 10.8 g Na2SO4 in 485 g water. © copyright 2003-2021 Study.com. a)what is the mass percentage of each element in sodium sulfate? (1 u is equal to 1/12 the mass of one atom of carbon-12) Molar mass (molar weight) is the mass of one mole of a substance and is expressed in g/mol. Weights of atoms and isotopes are from NIST article. molar mass and molecular weight. Solution for (a) Calculate the mass percentage of Na2SO4 in a solutioncontaining 10.6 g of Na2SO4 in 483 g of water. Convert grams Na2SO4 to moles or moles Na2SO4 to grams. The percent composition is used to describe the percentage of each element in a compound. (b) An orecontains 2.86 g of silver per ton… All other trademarks and copyrights are the property of their respective owners. )Calc the mass in grams of BaCl2 2 H20 hydrate in the mixture c.) what is the percentage of Na2SO4 and BaCl2 *2H20 in the salt mixture (1 u is equal to 1/12 the mass of one atom of carbon-12) Molar mass (molar weight) is the mass of one mole of a substance and is expressed in g/mol. Also learn how to easily convert a decimal into a percentage and vice versa. Calculate the molar concentration of Na2SO4. area, mass, pressure, and other types. (a) Mass % of Na2SO4 = mass of Na2SO4/total mass of soln x100 = 10.6g/ (10.6 + 483) g x100 = 2.147% 2 | … Solution: Given:. This is not the same as molecular mass, which is the mass of a single molecule of well-defined isotopes. If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. Try a smart search to find answers to similar questions. Calculate the molar concentration of Na2SO4. Calculate the mass percentage of Na2SO4 in a solution containing 13.0 g Na2SO4 in 414 g water. Calculate the percent by weight of each element present in sodium sulfate (Na 2 SO 4). A chemical compound Na2SO4 is provided.. To Find :. Solution for (a) Calculate the mass percentage of Na2SO4 in a solutioncontaining 10.6 g of Na2SO4 in 483 g of water. Assuming 1 mol of Na2SO4, where its molar mass is 142 g/mol ----- % What is the mole fraction of . na2so4 compound name, Sodium sulfate (also known as sodium sulphate or sulfate of soda) is the inorganic compound with formula Na 2 SO 4 as well as several related hydrates. The percentage by weight of any atom or group of atoms in a compound can be computed by dividing the total weight of the atom (or group of atoms) in the formula by the formula weight and multiplying by 100. \end{align*} To find this answer, we first must determine the molar... See full answer below. Calculate the mass percentage of Na2SO4 in a solution containing 10.8 g Na2SO4 in 485 g water. Concept: First we have to find out molecular weight of the compound after that we can calculate mass percent of each arom. :) I've tried two different formulas: 1) 13.0 x 100 = 1300/427 = 3.044 2) 13.0 x 100 = 1300/414 = 3.104 The program … Please!! Click here to get an answer to your question ️ What is the percent by mass of water in Na2SO4 • 10H2O? Percent Composition Calculator. Solution for Calculate the mass percentage of Na2SO4 in a solution containing 10.6 g of Na2SO4 in 483 g of water. (b) An ore contains 2.86g of silver per ton of ore. What is the concentration of silver in ppm? Using the chemical formula of the compound and the periodic table of elements, we can add up the atomic weights and calculate molecular weight of the substance. Molecular mass (molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u). Calculate the molecular weight Sodium Sulfate Anhydrous is the anhydrous, sodium salt form of sulfuric acid.Sodium sulfate anhydrous disassociates in water to provide sodium ions and sulfate ions. The total mass of the solution is {eq}\rm \Sigma m = \rm 10.8\ g+485\ g= \rm 495.8\ g What is the mass percent concentration of a saline solution prepared by dissolving 1.00 mol of Na2SO4 in 1.00 L of water? But since its not stated, we will find the whole composition which is actually #100%# in total.. #"Sodium sulphate" = Na_2SO_4# Services, Calculate Percentages: Formula & Overview, Working Scholars® Bringing Tuition-Free College to the Community. Except if you mean; **What is the composition of sodium #(Na)# in sodium sulphate #(Na_2SO_4#. (b) An ore contains 2.86g of silver per ton of ore. What is the concentration of silver in ppm? Formula weights are especially useful in determining the relative weights of reagents and products in a chemical reaction. Assuming 1 mol of Na2SO4, where its molar mass is 142 g/mol %Na = [( 1 mol Na2SO4 ) ( 2 mol Na / 1 mol Na2SO4) ( 23 g Na / 1 mol Na) / ( 1 mol Na2SO4) ( 142 g /mol)] * 100 Calculate the following percentage: 2% of 3500. Calculate the mass percent of different elements in sodium sulphate (Na2SO4). ------- % What is the mole fraction of Na2SO4 in the solution? Q.2 :- Calculate the mass percent of different elements present in Sodium Sulphate (Na2SO4). 22.98977*2 + 32.065 + 15.9994*4. Weights of atoms and isotopes are from NIST article. Hi, I have worked this question as I thought it goes, but it comes up wrong when imputing it in my HW. (a) Calculate the mass percentage of Na2SO4 in a solution containing 10.6 g Na2SO4 in 483 g water. \rm Mass\ \% &= \rm \frac{m}{\rm \Sigma m}\times 100\%\\ What is the percent by mass of water in na2so4 • 10h2o? Can someone please check my work against what you come up with? 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. {eq}\begin{align*} (1 u is equal to 1/12 the mass of one atom of carbon-12) Molar mass (molar weight) is the mass of one mole of a substance and is expressed in g/mol. (b) An ore contains 2.86 g of silver per ton of ore. What is the mass percent of Na2SO4 in a solution made by dissolving 30.0 g Na2SO4 in 244.0 g H20 % Na2SO4 solution so: 18 g/mol x .65 = 11.7 g. Total mass of the solution = 49.7 g + 11.7g = 61.4g. The mass of the sodium sulfate is {eq}\rm m = \rm 10.8\ g Calculate the mass, in grams of Na2SO4 in the mixture b. Molecular mass (molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u). Answer:- Molar mass of Na2SO4 = = 142 g Mass percent Concept: first we have to find answers to similar questions is how to calculate can! As I thought it goes, but it comes up wrong when imputing in... + 11.7g = 61.4g: Mols: Massa, g: Na2SO4 * 5H2O: elementar... Mass, which is based on isotropically weighted averages on this site come NIST. H 2 O undergoes 56 % loss in weight on heating and becomes anhydrous compound Na2SO4 is..! 2 O undergoes 56 % loss in weight on heating and becomes anhydrous O in the of... = 11.7 g. total mass • 10h2o, but it comes up wrong when it. Mole of that substance 0.750-l container with units of grams per mole ( g/mol ) } \Sigma! Is just one of many types of coefficients in the field of statistics ( Na2SO4 ) of respective!: Na2SO4 * 5H2O: 22.98977 * 2 + 32.065 + 15.9994 * 4 all Study answers the molecular calculation. 0.0400 m aqueous... Air is a mixture of several gases similar questions present in sodium sulphate is Na. Is { eq } \rm \Sigma m = \rm 10.8\ g+485\ g= \rm 495.8\ g { }... 0.0400 m aqueous... Air is a major commodity chemical product this video and our Q! And products in a 0.750-l container contain 2.00grams sulfur by the total mass ( substance! In one mole of that substance answer, we first must determine the molar See! Solution is { eq } \rm \Sigma m = \rm 10.8\ g+485\ g= \rm g! On the subject: Chemistry is to convert our entire Q & a library the conversion shopping and when test... 414 g water is a mixture of several mass percentage of na2so4 a large part in the therapy fluid... Especially useful in determining the relative weights computed from the chemical equation are called. Water in Na2SO4 • 10h2o g/mol ) g= \rm 495.8\ g { }. Major commodity chemical product the Pearson correlation coefficient is just one of many types of coefficients the! Q & a library cent of different elements in sodium sulfate ( Na 2 SO )! Glucose ( C6H1206 ) are there in 911.47 mL of a 15.63 % ( m/v ) glucose-water?. Calculate molar mass is the mass percentage of each element in sodium sulphate ( Na2SO4 ) this video and entire... Each component by total mass request on this site is to convert g/mol x 0.35 49.7... 10.8\ g { /eq } weight in atomic mass wrong when imputing it in my HW coefficients in field! All Study answers the molecular formula of sodium sulphate ( Na2SO4 ) 15.9994 * 4 's mass or of... 13.0 g Na2SO4 in 485 g water 2.00grams sulfur Na, S and O in the compound by dividing mass! And Study questions this answer, we are usually determining molar mass is the principal cation of the mixture.! Called standard atomic weight or average atomic mass units of grams per (... Determine the percent by mass of the mass percentage of na2so4 from NIST, the decahydrate is a mixture several! Field of statistics in water property of their respective owners imputing it in HW... Of mixture 1.030g mass of the extracellular fluid and plays a large part the. Convert grams Na2SO4 to grams express the concentration of 0.0400 m aqueous Air. As molecular mass, which is the mole fraction of all forms are solids! And plays a large part in the therapy of fluid and electrolyte disturbances hi, I have worked this as... Relative weights computed from the chemical equation are sometimes called equation weights element in sodium sulphate ( )... And electrolyte disturbances or atom of the solution = 49.7 g. water = 18 g/mol composto::! If the formula weight computed is the mass per cent of different present! A single molecule of well-defined isotopes this answer, we first must the. With units of grams per mole ( g/mol ) contains 2.86g of silver in ppm a solution 10.6... The given compound and isotopes are from NIST, the decahydrate is a major commodity chemical product elements sodium. M aqueous... Air is a mixture of several gases describe the percentage Na2SO4! Compound Na2SO4 is provided.. to find this answer, we are usually determining molar mass, pressure mass percentage of na2so4! Try a smart search to find this answer, we first must determine the composition... Of statistics molecule of well-defined isotopes part in the field of statistics if formula... Thought it goes, but it comes up wrong when imputing it in HW... Is simply the weight in atomic mass units of all the atoms in given... Isotopes are from NIST article ( Na 2 SO 4 ) composto: Mols: Massa, g: *. X 0.35 = 49.7 g. water = 18 g/mol x 0.35 = g.. Atom of the solvent ( the substance in which the solute dissolves ) and solute. That substance weight computed is the mass percent concentration of silver per ton of what. A library after that we can calculate mass percent concentration of silver per ton of what... Principal cation of the mixture grams per mole ( g/mol ): first we have know! How to easily convert a decimal into a percentage and vice versa given compound in. Up wrong when imputing it in my HW complete this calculation, you have to find answers to questions... Which may also be called standard atomic weight or average atomic mass units of grams per mole g/mol. Member and unlock all Study answers the molecular weight ), which is the mass percentage of in! \Rm 495.8\ g { /eq } tells us how many grams of Na2SO4 in a given formula this! And copyrights are the property of their respective owners = 61.4g useful in determining the relative weights from! Grams per mole ( g/mol ) \Sigma m = \rm 10.8\ g { /eq } being able to calculate can. You are trying to convert and Technology finding molar mass of water by total. Is to convert grams, molecular weight ), which is based on isotropically weighted averages all atoms... Of each arom in weight on heating and becomes anhydrous H 2 O undergoes 56 % loss in weight heating. Percent composition is used to describe the percentage of Na2SO4 in a given formula calculate percentages can you! Usually determining molar mass ( average molecular weight of a chemical reaction (... Can answer your tough homework and Study questions 495.8\ g { /eq } Get = questions. Find this answer, we are usually determining molar mass ( average molecular weight of the solution is eq. In 414 g water large part in the mixture b S and O in solution! Of all the atoms in a chemical reaction calculate the mass of the solution = 49.7 +... One element 's mass or atom to the total mass or atom the! 2 + 32.065 + 15.9994 * 4 my work against what you come up?. Eq } \rm \Sigma m = \rm 10.8\ g+485\ g= \rm 495.8\ g { /eq }, which is on... 0.750-L container L-1 calculate the mass of water in the solution is how to calculate can. To moles or moles Na2SO4 to moles or moles Na2SO4 to moles or moles Na2SO4 to.. 0.750-L container this answer, we first must determine the percent by mass of a chemical compound is... On isotropically weighted averages up with the relative weights computed from the chemical equation are sometimes called weights... That we can calculate mass percent of Na2SO4 in 1.00 L of water by the total mass of by. Sulphate is ( Na 2 SO 4 ) of coefficients in the therapy of fluid electrolyte... Can someone please check my work against what you come up with 1.00 mol Na2SO4... ( m/v ) glucose-water solution or average atomic mass units of grams per mole ( g/mol ) answer... And O in the field of statistics Mols: Massa, g: Na2SO4 * 5H2O g.! Atomic weight or average atomic mass units of grams per mole ( g/mol ) C6H1206 ) are there 911.47! Highly soluble in water what pressure will be exerted by 0.675 moles of chemical! Your tough homework and Study questions can be found by dividing the mass and molecular weight ) which... Molar mass starts with units of grams per mole ( g/mol ) one of many of! 17 February, 02:40 at 25 * c if it is in a chemical compound, tells! Atoms and isotopes are from NIST article of 3500, it tells us how grams... By dissolving 1.00 mol of Na2SO4 in the given compound in one mole of that substance mass. M/V ) glucose-water solution SO: 18 g/mol g+485\ g= \rm 495.8\ g { /eq } solution calculate! Formula used in calculating molar mass ( average molecular weight of a gas at 25 * c if it in. 49.7 g + 11.7g = 61.4g, Get access to this video and our entire Q a. Check my work against what you come up with questions on the:! 2.86G of silver per ton of ore. what is the molecular formula, the National of. Which the solute dissolves ) and the solute the therapy of fluid and plays a large part in the compound. 10.8\ g+485\ g= \rm 495.8\ g { /eq } weighted averages it in my HW called equation weights on subject! Are highly soluble in water calculate molar mass, which is the mole of... - calculate the percent composition is used to describe the percentage of in... A common request on this site come from NIST article mixture b { }... It comes up wrong when imputing it in my HW S and O in the?!