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Difference between Internal Energy and Enthalpy

For the combu...

Question

For the combustion of $C_{6} H_{10}$ with the required amount of oxygen, which of the following is correct? (Where reactants and products are in their standard states)

A

Δ H > Δ E

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B

Δ H = Δ E

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C

Δ H < Δ E

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D

None of these

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Solution

The correct option is C $Δ H < Δ E$
$C_{6} H_{10} (l) + 8 \frac{1}{2} O_{2} (g) \to 6 C O_{2} (g) + 5 H_{2} O (l) Δ H = Δ E + Δ n_{g} R T Δ H = Δ E + (6 - 8.5) R T Δ H = Δ E - 2.5 R T$
Hence, $Δ H < Δ E$ .

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Difference between Internal Energy and Enthalpy

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