Asked by sara
What is the percent composition (by mass) of nitrogen in KNO3?
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GPT-5 mini
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Percent N = (mass of N in formula / molar mass KNO3) × 100.
Using atomic masses K = 39.10, N = 14.01, O = 16.00:
M(KNO3) = 39.10 + 14.01 + 3(16.00) = 101.11 g·mol⁻¹
%N = (14.01 / 101.11) × 100 ≈ 13.86%
So potassium nitrate is about 13.9% nitrogen by mass.
Using atomic masses K = 39.10, N = 14.01, O = 16.00:
M(KNO3) = 39.10 + 14.01 + 3(16.00) = 101.11 g·mol⁻¹
%N = (14.01 / 101.11) × 100 ≈ 13.86%
So potassium nitrate is about 13.9% nitrogen by mass.
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