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

Published by Cengage Learning

# Chapter 3 - Chemical Reactions - Questions for Review and Thought - General Questions - Page 148g: 98b

#### Answer

$Cu$ is the identity of the metal, because it gives exactly 0.376 g of carbon dioxide.

#### Work Step by Step

1. Calculate the number of moles of $CuCO_3$: 63.55* 1 + 12.01* 1 + 16* 3 = 123.56g/mol $1.056g \times \frac{1 mol}{ 123.56g} = 8.546 \times 10^{-3}mol (CuCO_3)$ - The balanced reaction is: $CuCO_3 -- \gt CuO + CO_2$ The ratio of $CuCO_3$ to $CO_2$ is 1 to 1: $8.546 \times 10^{-3} mol (CuCO_3) \times \frac{ 1 mol(CO_2)}{ 1 mol (CuCO_3)} = 8.546 \times 10^{-3}mol (CO_2)$ 2. Calculate the mass of $CO_2$: 12.01* 1 + 16* 2 = 44.01g/mol $8.546 \times 10^{-3} mol \times \frac{ 44.01 g}{ 1 mol} = 0.376g (CO_2)$

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