How many moles are there in 280 g of KOH? (molar mass 56 g/mol)

Answer and explanation

Correct answer: B. 5 mol

  1. Step 1: Moles = mass ÷ molar mass. Step 2. 280 ÷ 56 = 5 mol. Answer: 5 mol. Why not the others: 15680 mol is what you get if you multiply the mass by the molar mass. 0.2 mol is what you get if you invert the ratio. 224 mol is what you get if you subtract the molar mass.

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