to find this use establish the number of moles of CO2:
1000kg = 1 000 000 grams
n = 1 000 000/44(molecular weight of CO2)
n = 22727.27 moles of CO2 gas
then find the combustion formula for ethanol:
2C2H5OH + 5O2 --> 4CO2 + 3H2O
2: 5: 4: 3
then as there is double the ratio of moles...