Calculate the mass fraction of oxygen in nitric acid

Given:
HNO3

To find:
ω (O) -?

Decision:
1) ω (O) = N (O) * Ar (O) * 100% / Mr (HNO3) = 3 * 16 * 100% / 63 = 76.19%.

Answer: Mass fraction of O is 76.19%.



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