Asked Mar 10, 2020

The standard enthalpies of formation of gaseous propyne
(C3H4), propylene (C3H6), and propane (C3H8) are
+185.4, +20.4, and -103.8 kJ/mol, respectively. (a) Calculate
the heat evolved per mole on combustion of each substance to
yield CO2(g) and H2O(g). (b) Calculate the heat evolved on
combustion of 1 kg of each substance. (c) Which is the most
efficient fuel in terms of heat evolved per unit mass?

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