AP Chemistrymediummcq1 pt
What is the mass percent of nitrogen in ammonium nitrate, NH₄NO₃ (molar mass 80.04 g/mol)?
A.35.0%
B.17.5%
C.65.0%
D.5.04%
Explanation
Core Concept
Two nitrogens contribute 2 × 14.01 = 28.02 g per mole of compound. Dividing by the formula mass gives 28.02 ÷ 80.04 = 0.350, or 35.0%. Percent composition always divides the element's total contribution by one mole of the whole formula, honoring every subscript.
Correct Answer
A35.0%
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