First slide

Enthalpy of Combustion

Question

The heats of combustion of ethane, ethene and acetylene are -341.1, -330 and –310.9 K.Calmol^–1 respectively. The best fuel among them is

Moderate

Solution

Fuel with highest calorific value is best fuel.
$\large Calorific\;value = \frac{{Heat\;ofcombustion}}{{Mol.Wt}}\$

Hydro carbon Calorific value

C₂H₄ $\large \frac{{ - 341.1}}{{30}}\; = \;11.37\$

C₂H₄ $\large \frac{{ - 330}}{{28}}\; = \;11.78\$

C₂H₂ $\large \frac{{ - 310.9}}{{26}}\; = \;11.95\$

Higher calorific value is for acetylene
Hence it is better fuel.

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