When 10 ml of propane (gas) is combusted completely, volume of CO2g obtained in similar condition is

C3 H8(g)+5O2(g)→3CO2(g)+4H2O(l)Each Propane molecule is made out of 3 Carbons and 8 Hydrogen atoms. During combustion, each Carbon is converted into a molecule of gaseous CO2 and every pair of hydrogens into a water molecule. So, 3 Carbons of a Propane molecule gives 3 molecules of CO2. Similarly, 10mL of Propane gives 30mL of CO2.