1. The problem statement, all variables and given/known data In 0.50 moles of CaCO3 how many moles of carbon are present? How many moles of oxygen are present? Given: 0.50 moles of CaCO3 Molar mass is 100.9 g/mol 2. Relevant equations n=m/M 3. The attempt at a solution I'm not quite sure how to do this question would I begin by finding the mass? Because if so the mass of CaCO3 would be 50.45 g I'm assuming because m=nM. But then I do not know where to go from there would I find the mass of each of them?