calculate the number of moles and mass

Question

of methane (ch4) required to produce 11 kg of carbondoxide(co2) when combusted ?

Answer 1

CH4 + 2O2 ==> CO2 + 2H2O
mols CO2 = 11,000/molar mass CO2 = ?
Using the coefficients in the balanced equation, convert mols CO2 to mols CH4.
Now grams CH4 = mols CH4 x molar mass CH4