so this is the question: A fuel is being developed using a 1:1 molar ratio of octane and ethanol. Write the equation for the complete combustion of this fuel.
Calculate the energy released, in kJ, by the complete combustion of 8.00kg of this fuel
ΔcH (C8H18)= -5470kJ mol-1 ΔcH (C2H5OH) = -1367kJ mol-1
I understand how to calculate the moles of ethanol and octane . it is :
Mr: (C8H18)= 114
Mr: (C5H5OH)= 46
Mass= moles x mr
= (1x114) + (1x46)= 160g
C8H18 (50mol) & C5H5OH (50mol)
so 8.00kg contains 50mol of each
im not sure how to calculate the enthalpy change of combustion tho. I've assembled a hess cycle. I got -341850 (kJ) . the mark scheme shows 341850 (kJ) . can someone explain this?