The heat of formation - Hf of H2Og is -243 kJ- -E of it at temperature T is-

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Thermodynamic Processes

The heat of f...

Question

The heat of formation $(Δ H_{f})$ of $H_{2} O (g)$ is -243 kJ. $Δ$ E of it at temperature T is:

-243 + RT

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-243 - RT

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-243 + 1/2 RT

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-243 - 1/2 RT

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Solution

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H_{2} O

25^{0} C

Δ U

H_{2} (g) + \frac{1}{2} O_{2} (g) \to H_{2} O (g)

25^{0} C

(243^{0.12} \times 243^{0.08})^{2}

\frac{1}{2} \sqrt{243} - \sqrt{\frac{27}{4}}

3^{3} \times {(243)}^{- \frac{2}{3}} \times 9^{- \frac{1}{3}}

3^{3} \times (243)^{- \frac{2}{3}} \times 9^{- \frac{1}{3}}

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