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Lattice Energy

Calculate the...

Question

Calculate the difference in $△ H$ and $△ U$ for combustion of methane at $25^{0} C$ .

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Solution

$C H_{4} (g) ⇌ C O_{2} (g) + 2 H_{2} O (l)$
$Δ H - Δ U = Δ n_{g a s} R T$
$= (1 - 2 - 1) R T$
$- 2 \times \frac{23}{3} \times 298 J$
$= - 5.562 k J$

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