The standard heat of formation ∆ f H 298 0 of ethane (in k J / m o l ), if the heat of combustion of ethane, hydrogen and graphite are - 1560 , - 393.5 and - 286 k J / m o l , respectively is ________

Step-by-step solution

2 C ( graphite ) + 3 H 2 ( g ) → C 2 H 6 ( g ) Δ f H C 2 H 6 = 2 Δ H comb C gaphite + 3 Δ H comb H 2 − Δ H comb C 2 H 6 = − ( 286 × 2 ) − ( 393.5 × 3 ) − ( − 1560 ) = − 572 − 1180.5 + 1560 = − 192.5 kJ / mole