Question

a sample of hydrocarbons undergoes complete combustion to produce CO2 and H2O.IF 8.80gm of CO2is obtained, then what will be the mass of Carbom present in it

Answer 1

Since a hydrocarbon's carbon content is always converted to CO2 due to complete combustion, the mass of carbon in the given sample will be equal to the mass of carbon in the CO2 formed.
44 g CO2 = 1 mol
8.8 g CO2 = 0.2 mol
The CO2 formed is 0.2 mol, so it will contain 0.2 mol carbon.
Mass of 0.2 mol carbon = 0.2*12 = 2.4 g
So the given sample of hydrocarbon contains 2.4 g carbon.