What is the molar mass of CaCO₃? (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: C. 100 g/mol

  1. Step 1: Add the atomic masses of all the atoms in the formula. Step 2. CaCO₃: 40 + 12 + 3 × 16 = 100 g/mol. Answer: 100 g/mol. Why not the others: 40 g/mol is what you get if you use the molar mass of NaOH. 36.5 g/mol is what you get if you use the molar mass of HCl. 18 g/mol is what you get if you use the molar mass of H₂O.

Practise more Physics and chemistry.

Free questions with an explanation for every one, and full timed DTM University Entrance Test (Uzbekistan) mock tests.

All Physics and chemistry questionsTake a mock test

More Physics and chemistry questions