Given the following enthalpies of formation, calculate the standard enthalpy change for the incomplete combustion of ethance (C2H6)

Question

Reactants/Products ▲H f

C₂H₆ -84.68 kJ/mol

O₂ 0.00 kJ/mol

CO -110.5 kJ/mol

H₂O -285.8 kJ/mol

Answer 1

First, you need the balanced equation:

C₂H₆ + (5/2)O₂ → 2CO + 3H₂O The ΔH of rxn in this form is the energy per 1 mole of ethane partially combusted

The ΔH_rxn = 2ΔH_f,CO + 3ΔH_f,H2O - ΔH_f,C2H6

I'll let you do the calculation. Please consider a tutor. Take care.