Question

Calculate the mass of CO2 which contains the same number of molecules as are contained in 40 g of oxygen.

Answer 1

40g of oxygen contains 40/32)*6.022*10^23 molecules = 7.5*10^23 molecules

Now 44g of CO2 contains 6.022*10^23 molecules, thus 7.5*10^23 molecules will be present in 7.5*10^23 * 44/ 6.022*10^23 = 55g