Question

calculate no. of oxide ions present in 10g of calcium carbonate

Answer 1

Molar mass of CaCO3 = 40 + 12 + 16 x 3 = 100

(A) Amount of carbon in 10 g of CaCO3 = 0.12 g = 1.2/12 g-atom = 0.1 g-atom.

(B) Amount of oxygen in 10 g of CaCO3 = 4.8 g = 4.8/16 g-atom = 0.3 g-atom.

(C) Amount of calcium in 10 g of CaCO3 = 4 g.

So the correct answer is (B) only.