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PROBLEM-SOLVING EXAMPLE 3-6 Percent Composition of Hydrated Salt Epsom salt is MgSO4-7 H2O. (a) What is the percent by mass of water in Epsom salt? (b) What are the percentages of each element in Epsom salt? Strategy and Explanation a. We first find the molar mass of Epsom salt, which is the sum of the molar masses of the atoms in the chemical formula: [1 mol Mg x (24.31 g Mg/mol Mg)] + [1 mol S x (32.07 g S/mol S)] + [4 mol O x (15.9994 g O/mol O)] + [14 mol H x (1.0079 g H/mol H)] + [7 mol O x (15.9994 g O/mol O)] = 246.49 g/mol Epsom salt %3D Because 1 mol Epsom salt contains 7 mol H,O, the mass of water in 1 mol Epsom salt is. 7 mol H,O x (18.012 g H,O/mol H,O) = 126.08 g H,O %3D 126.08 g mol Epsom salt 246.49 g/mol Epsom salt water per % Н.О x 100% 51.15% H,О D. We calculate the percentage of magnesium from the ratio of the mass of magnesium in 1 mol Epsom salt to the mass of Epsom salt in 1 mol: % Mg mass of Mg in 1 mol Epsom salt mass of Epsom salt in 1 mol 24.31 g Mg 246.49 g/mol Epsom salt x 100% 9.862% Mg

PROBLEM-SOLVING EXAMPLE 3-6 Percent Composition of Hydrated Salt Epsom salt is MgSO4-7 H2O. (a) What is the percent by mass of water in Epsom salt? (b) What are the percentages of each element in Epsom salt? Strategy and Explanation a. We first find the molar mass of Epsom salt, which is the sum of the molar masses of the atoms in the chemical formula: [1 mol Mg x (24.31 g Mg/mol Mg)] + [1 mol S x (32.07 g S/mol S)] + [4 mol O x (15.9994 g O/mol O)] + [14 mol H x (1.0079 g H/mol H)] + [7 mol O x (15.9994 g O/mol O)] = 246.49 g/mol Epsom salt %3D Because 1 mol Epsom salt contains 7 mol H,O, the mass of water in 1 mol Epsom salt is. 7 mol H,O x (18.012 g H,O/mol H,O) = 126.08 g H,O %3D 126.08 g mol Epsom salt 246.49 g/mol Epsom salt water per % Н.О x 100% 51.15% H,О D. We calculate the percentage of magnesium from the ratio of the mass of magnesium in 1 mol Epsom salt to the mass of Epsom salt in 1 mol: % Mg mass of Mg in 1 mol Epsom salt mass of Epsom salt in 1 mol 24.31 g Mg 246.49 g/mol Epsom salt x 100% 9.862% Mg

Introductory Chemistry: A Foundation
Introductory Chemistry: A Foundation
9th Edition
ISBN:9781337399425
Author:Steven S. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Donald J. DeCoste
Chapter8: Chemical Composition
Section: Chapter Questions
Problem 128CP: itamin B12 , cyancobalamin, is essential for human nutrition. Its molecular formula is...
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PROBLEM-SOLVING EXAMPLE 3-6 Percent Composition of Hydrated Salt Epsom salt is MgSO4 7 H,O. (a) What is the percent by mass of water in Epsom salt? (b) What are the percentages of each element in Epsom salt? Strategy and Explanation a. We first find the molar mass of Epsom salt, which is the sum of the molar masses of the atoms in the chemical formula: [1 mol Mg x (24.31 g Mg/mol Mg)] + [1 mol S × (32.07 g S/mol S)] + [4 mol O x (15.9994 g O/mol O)] + [14 mol H x (1.0079 g H/mol H)] + [7 mol O x (15.9994 g O/mol O)] = 246.49 g/mol Epsom salt %3D Because 1 mol Epsom salt contains 7 mol H,O, the mass of water in 1 mol Epsom salt is, 7 mol H,O x (18.012 g H,O/mol H,O) = 126.08 g H,0 126.08 g water per mol Epsom salt % H,O x 100% = 51.15% H,0 246.49 g/mol Epsom salt D. We calculate the percentage of magnesium from the ratio of the mass of magnesium in 1 mol Epsom salt to the mass of Epsom salt in 1 mol: % Mg mass of Mg in 1 mol Epsom salt mass of Epsom salt in 1 mol 24.31 g Mg 246.49 g/mol Epsom salt × 100% 9.862% Mg %3D
Transcribed Image Text:PROBLEM-SOLVING EXAMPLE 3-6 Percent Composition of Hydrated Salt Epsom salt is MgSO4 7 H,O. (a) What is the percent by mass of water in Epsom salt? (b) What are the percentages of each element in Epsom salt? Strategy and Explanation a. We first find the molar mass of Epsom salt, which is the sum of the molar masses of the atoms in the chemical formula: [1 mol Mg x (24.31 g Mg/mol Mg)] + [1 mol S × (32.07 g S/mol S)] + [4 mol O x (15.9994 g O/mol O)] + [14 mol H x (1.0079 g H/mol H)] + [7 mol O x (15.9994 g O/mol O)] = 246.49 g/mol Epsom salt %3D Because 1 mol Epsom salt contains 7 mol H,O, the mass of water in 1 mol Epsom salt is, 7 mol H,O x (18.012 g H,O/mol H,O) = 126.08 g H,0 126.08 g water per mol Epsom salt % H,O x 100% = 51.15% H,0 246.49 g/mol Epsom salt D. We calculate the percentage of magnesium from the ratio of the mass of magnesium in 1 mol Epsom salt to the mass of Epsom salt in 1 mol: % Mg mass of Mg in 1 mol Epsom salt mass of Epsom salt in 1 mol 24.31 g Mg 246.49 g/mol Epsom salt × 100% 9.862% Mg %3D
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