Question: how many moles of oxygen atoms are there in 500g of caco3?
Answer: 200 g of calcium carbonate contains oxygen atoms = 200*3*6.022*1023/100. firstly we find the mole of CaCO3 . Now, in CaCO3 1 mol CaCO3 contains 3 mol O . Hence, 36.138*10^23 atoms of oxygen are present in 200 g of caco3.