What is the mass of 0.25 mol of KMnO₄? (molar mass 158 g/mol)

Answer and explanation

Correct answer: D. 39.5 g

  1. Step 1: Mass = moles × molar mass. Step 2. 0.25 × 158 = 39.5 g. Answer: 39.5 g. Why not the others: 632 g is what you get if you divide the molar mass by the moles. 158.25 g is what you get if you add the numbers. 3.95 g is what you get if you misplace the decimal point.

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