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Hydrogen cyanide (HCN) is produced by a two-step process: Step 1: 4 NH3(g) + 5 O2(g) -> 4 NO(g) + 6 H2O(g) Step 2: 2 NO(g) + 2 CH4(g) -> 2 HCN(g) + 2 H2O(g) + H2(g) If 25.5 g of ammonia and 32.0 g of methane are used, how many grams of HCN can be produced? (Assume O2 is in excess.)

1. 1.5
2. 2.0
3. 40.5
4. 54.0

Correct answer: 40.5

Solution

Converting given masses to moles and tracking stoichiometry through both steps determines which reactant limits HCN production.

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