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Thermodynamics (C) question bank (Chemistry)

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Q1.

What is the enthalpy of formation of HF if bond enthalpies of H-H, F-F and H-F bonds are $434$ kJ/mol, $158$ kJ/mol and $565$ kJ/mol respectively. ?

(A)

$-267$ kJ/mol

(B)

$-269$ kJ/mol

(C)

$-271$ kJ/mol

(D)

$-276$ kJ/mol

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Q2.

The relationship between $\Delta H$ and $\Delta U$ for the reaction, $\text{PCl}_3(g) + \text{Cl}_2(g) \rightarrow \text{PCl}_5(g)$ is given as

(A)

$\Delta H = \Delta U + 2RT$

(B)

$\Delta H = \Delta U - 2RT$

(C)

$\Delta H = \Delta U + RT$

(D)

$\Delta H = \Delta U - RT$

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