How much calcium is present in 0.1g of CaCO₃?

0.01 g

0.02 g

0.03 g

0.04 g

The molar mass of CaCO₃ is approximately 100 g/mol.

The molar mass of calcium (Ca) in CaCO₃ is about 40 g/mol.

The proportion of calcium in CaCO₃ is 40/ 100 = 0.4

Therefore, in 0.1 g of CaCO₃, the amount of calcium is 0.1×0.4=0.04 g.