Question

How many atoms of oxygen are present in 50g of caco3?

Answer 1

Mol. wt. of CaCO3 = 40 + 12 + 3 X 16=100g

100 g of CaCO contains = 3 x 6.022 x 10^23 atoms of oxygen


There fore, 50 g CaCO3 will contain = 3 X 6.022 X 10^23 X 50/100 = 9.033 X 10^23 atoms of oxygen

Answer 2

Mo.l weight of CaCO3 = 40 + 12 + 3 X 16=100g

100 g of CaCO contains = 3 x 6.022 x 10^23 atoms of oxygen

There fore, 50 g CaCO3 will contain = 3 X 6.022 X 10^23 X 50/100 = 9.033 X 10^23 atoms of oxygen