What is the molecular formula of ethane a hydrocarbon that is 80.0% carbon and 20.0% hydrogen by mass the molar mass of ethane is 30g Mol?

is 80.0% carbon and 20.0% hydrogen by mass? The molar mass of ethane is 30g/mol.o    Carbon: 80 percent/ 12.011 amu = 6.660564452 then 6.660564452/6.660564452 = 1 Carbono    Hydrogen: 20 percent/ 1.008 amu = 19.84126984 then 19.84126984 /6.660564452 = 3 Hydrogeno    Ratio: 1:3 so, CH3, o    Ethane, 30*How do I get from CH3to C2H6