Given:
Amount of CO2 produced = 62 g
To determine:
Amount of O2 consumed
Explanation:
If ethanol (C2H5OH) is the fuel used during combustion then the reaction is:
C2H5OH + 3O2 → 2CO2 + 3H2O
Based on the reaction stoichiometry:
3 moles of O2 will produce 2 moles of CO2
# moles of CO2 produced = 62 g/ 44 g.mol-1 = 1.4091 moles
Therefore,
# moles of O2 consumed = 1.4091 *3/2 = 2.1137 moles
Mass of O2 used up = 2.1137 moles * 32 g/mole = 67.64 g
Ans: The mass of O2 used up during combustion of ethanol would be around 68 g
