Question

On complete combustion at costant pressure, a 1.00L sample of a gaseous mixture at 0 C and 1.00 atm (STP) evolves 75.65 kJ of heat If the gas is a mixture of ethane (C2H6) and propane (C3H8), what is the mole fraction of ethane in the mixture?

C2H6 : -84.7 kJ/mol
C3H8 : -103.8 kJ/mol

CO2 : -393.5 kJ/mol
H2O (g) : -241.8 kJ/mol

Answer 1