Question

4. What is correct for 10 g of CaCO,?
(A) It contains 1g-atom of carbon
(B) It contains 0.3 g-atoms of oxygen
(C) It contains 12 g of calcium
(D) None of these​

Answer 1

Answer:

Explanation:

•   The MolecularMass of CaCO3=100g.

•    So 10 g of CaCO3 = 0.1 mole of CaCO3

•    So it contains0.1 x 40= 4 g of Ca

•    It contain=0.1 g Atom of Carbon

•    It contains= 0.1 x 3= 0.3 g -atoms of oxygen.

•    So the correct answer is (B) contains 0.3 g-atoms of oxygen.