Explanation The mass percent of tungsten and chlorine is as follows: Mass % W Mass % Cl 72.17 27.83 56.45 43.55 50.91 49.09 46.36 53.64 The mass percent of W and Cl is 72.17% and 27.83% respectively. Assuming 100 g of compound, the mass percent of W and Cl is 72.17 g and 27.83 g respectively. The molar mass of W and Cl is 183.84 g/mol and 35.5 g/mol thus, ratio of number of moles can be calculated as follows: n W n Cl = ( m / M ) W ( m / M ) Cl Putting the values, n W n Cl = ( 72.17 g / 183.84 g/mol ) W ( 27.83 g / 35.5 g/mol ) Cl = 0.4 0.784 = 1 : 2 Thus, for 1 atom of W there are 2 atoms of Cl in the formula of compound 1. Mass % W Mass % Cl 72.17 27.83 56.45 43.55 50.91 49.09 46.36 53.64 In compound 2, the mass percent of W and Cl is 56.45% and 43.55% respectively. Assuming 100 g of compound, the mass percent of W and Cl is 56.45 g and 43.55 g respectively. The molar mass of W and Cl is 183.84 g/mol and 35.5 g/mol thus, ratio of number of moles can be calculated as follows: n W n Cl = ( m / M ) W ( m / M ) Cl Putting the values, n W n Cl = ( 56.45 g / 183.84 g/mol ) W ( 43.55 g / 35.5 g/mol ) Cl = 0.3 1.2 = 1 : 4 Thus, for 1 atom of W there are 4 atoms of Cl in the formula of compound 2 Mass % W Mass % Cl 72

8th Edition

ISBN: 9781305079113

Author: David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher: Cengage Learning

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Question

Chapter 1, Problem 10P

Interpretation Introduction

Interpretation: The formulas of four compounds need to be determined.

Concept Introduction: The number of moles can be calculated from mass and molar mass as follows:

n=mM

Here, m is mass and M is molar mass.

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Chapter 1 Solutions

Principles of Modern Chemistry

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