What is the molar mass of KMnO₄? (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Mn = 55, Fe = 56)

Answer and explanation

Correct answer: D. 158 g/mol

  1. Step 1: Add the atomic masses of all the atoms in the formula. Step 2. KMnO₄: 39 + 55 + 4 × 16 = 158 g/mol. Answer: 158 g/mol. Why not the others: 98 g/mol is what you get if you use the molar mass of H₂SO₄. 58.5 g/mol is what you get if you use the molar mass of NaCl. 102 g/mol is what you get if you use the molar mass of Al₂O₃.

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