How many moles are there in 126 g of HNO₃? (molar mass 63 g/mol)

Answer and explanation

Correct answer: A. 2 mol

  1. Step 1: Moles = mass ÷ molar mass. Step 2. 126 ÷ 63 = 2 mol. Answer: 2 mol. Why not the others: 7938 mol is what you get if you multiply the mass by the molar mass. 0.5 mol is what you get if you invert the ratio. 63 mol is what you get if you subtract the molar mass.

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