Calculate the amount of heat released by the combustion of 20 liters (0*C, 101325 Pa) of diborane if ΔH(B2H5) = 31.4 kJ/mol and ΔH(B2O3) = -1264 kJ/mol? Is it advisable to use diborane instead of ethane as fuel if the standard ethanol combustion heat is -1559,88 kJ/mol?