The difference between ∆ H and ∆ U is ∆ H - ∆ U , when the combustion of one mole of heptane l is carried out at a temperature T , is equal to:

Step-by-step solution

Combustion of heptane C 7 H 16 l + 11 O 2 g ⟶ 7 C O 2 g + 8 H 2 O l ∆ H = ∆ U + ∆ n g R T ∆ H - ∆ U = ∆ n g R T ∴ ∆ n g = 7 - 11 = - 4 = - 4 × R T