A mixture of methane (CH4), hydrogen (H2) and nitrogen (N2) with a volume of 100 ml,

burned completely with 120 ml of O2 gas (excessive). Combustion gas is flowed

through a tube containing CaCl2 so that all the water vapor will be absorbed. Gas coming out of

The volume of the CaCl2 tube is 75 ml. This gas mixture is flowed through a KOH solution where

CO2 gas will be absorbed. The gas that comes out of this KOH solution has a volume of 40 ml. All

gases are measured at the same temperature and pressure. What is the volume composition of the gas mixture?

at first