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Introduction

For the react...

Question

For the reaction
$C_{3} H_{8} (g) + 5 O_{2} (g) \to 3 {C O}_{2} (g) + 4 H_{2} O (l)$ at constant temperature, $Δ H - Δ U$ is _______ .

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Solution

$△ H = △ U + △ n R T$
$△ H - △ U = △ n R T$
$T$ is constant $\Rightarrow △ T = 0 \Rightarrow n R T = 0$
$△ H - △ U = 0$

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