What is the molar mass of CH₄? (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: B. 16 g/mol

  1. Step 1: Add the atomic masses of all the atoms in the formula. Step 2. CH₄: 12 + 4 × 1 = 16 g/mol. Answer: 16 g/mol. Why not the others: 64 g/mol is what you get if you use the molar mass of SO₂. 58.5 g/mol is what you get if you use the molar mass of NaCl. 56 g/mol is what you get if you use the molar mass of CaO.

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