## Chemistry: The Molecular Science (5th Edition)

Published by Cengage Learning

# Chapter 3 - Chemical Reactions - Questions for Review and Thought - Topical Questions - Page 149e: 71c

#### Answer

739 g of $H_2O$ didn't react.

#### Work Step by Step

As we determined in 71a, the limiting reactant is methane, so: 1. Calculate the number of moles of $CH_4$: 12.01* 1 + 1.008* 4 = 16.042g/mol $500g \times \frac{1 mol}{ 16.042g} = 31.168mol (CH_4)$ - The balanced reaction is: $CH_4 + H_2O -- \gt CO + 3H_2$ The ratio of $CH_4$ to $H_2O$ is 1 to 1: $31.168 mol (CH_4) \times \frac{ 1 mol(H_2O)}{ 1 mol (CH_4)} = 31.168mol (H_2O)$ 2. Calculate the mass of $H_2O$: 1.008* 2 + 16* 1 = 18.016g/mol $31.168 mol \times \frac{ 18.016 g}{ 1 mol} = 561g (H_2O)$ 561g of water reacted, and we had 1300 g initially: 1300 - 561 = 739 g

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