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Calorimetry

Δ U o of comb...

Question

$Δ U^{o}$ of combustion of methane is $- X$ $k J$ ${m o l}^{- 1}$ . The value of $Δ H^{o}$ is:

A

= Δ U^{o}

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B

> Δ U^{o}

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C

< Δ U^{o}

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D

= 0

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Solution

The correct option is A $< Δ U^{o}$
Reaction;
$C H_{4} (g) + 2 O_{2} (g) ⟶ C O_{2} (g) + 2 H_{2} O (l)$

Now,
$Δ n_{g} = (n_{p} - n_{r}) = 1 - 3 = - 2$

Again,
$Δ H^{o} = Δ U^{o} + Δ n_{g} R T$

$Δ H^{o} = - X - 2 R T$

$∴ Δ H^{o} < Δ U^{o}$

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Similar questions

Δ U^{o}

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△ U^{θ}

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