Molar mass of oxygen is: M(O)=16 g/mol Molar mass of carbon is: M(C)=12 g/mol Molar mass of carbon dioxide is: M(CO2)=M(C)+2*M(O) M(CO2)=12 g/mol+2*16g/mol M(CO2)=44 g/mol
Molar mass(M) is the mass of 1 mole of the substance (grams per mole of a compound).