First slide

Relation between Delta H and Delta U

Question

Which of the following holds good to the laws of thermodynamics for the reaction? C₂H_4(g)+ 3O₂ (g) $\to$ 2CO_2(g)+2H₂0_(l)

Moderate

A

$\large \Delta H\,=\,\Delta E+RT$
B

$\Delta H\,=\,\Delta E-RT$
C

$\Delta H\,=\,\Delta E+2RT$
D

$\Delta H\,=\,\Delta E-2RT$

Solution

$∆ H = ∆ E - ∆ nRT$
where $∆ n = 2 - 4 = - 2$
$∆ H = ∆ E - 2 RT$

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