What is the mass percent of nitrogen in ammonium nitrate (NH₄NO₃, molar mass = 80.0 g/mol)? (Atomic mass N = 14.0 g/mol)
Answer and explanation
Correct answer: C. 35.0%
- Step 1: Identify the number of nitrogen atoms in the formula: NH₄NO₃ contains 2 nitrogen atoms.
- Step 2: Compute nitrogen mass and percent: . Mass percent .
Answer
35.0%.
Why not the others: 17.5% only counts one nitrogen atom; 28.0% is the absolute mass in grams; 42.0% miscalculates with three nitrogens.
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