Concept explainers
When copper(ll) oxide is heated in the presence Of hydrogen gas, elemental copper and water are produced. What mass of copper can be obtained if 32.0 g of copper(ll) oxide is used?

Interpretation:
Mass of Copper is to be determined
Concept introduction:
When copper oxide is heated in presence of hydrogen gas, it produce elemental copper and water.
Answer to Problem 100A
Mass of Copper is 25.54 g
Explanation of Solution
Step 1: write balance chemical equation
Step 2: convert mass of reactant to moles
Step 3: Convert moles of reactant to moles of product using mole ratio
1 mole of CuO produce = 1 moles of Cu
0.402 moles of CuO produce = 0.402 moles of Cu
Step 4: Convert moles of product to mass (theoretical yield)
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Chemistry: Matter and Change
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