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  4. The difference between the heat change at constant pressure and that at constant volume for the combustion of 46 g of ethanol at 27° C is

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Q. The difference between the heat change at constant pressure and that at constant volume for the combustion of $46\, g$ of ethanol at $27^{\circ} C$ is

Thermodynamics

Solution:

$C _{2} H _{5} OH _{(l)}+3 O _{2(g)} \rightarrow 2 CO _{2(g)}+3 H _{2} O _{(g)} ; \Delta n_{(g)}=2-3=-1$

$q_{p}-q_{v}=\Delta n_{g} R T=(-1) \times 8.314 \times 300= -2.49\, kJ$