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Thermodynamics (C) question bank (Chemistry)

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Q1.

Calculate $\Delta H$ for a reaction, $2X_{(g)} + Y_{(g)} \rightarrow 2Z_{(g)}$ at $298$ K if $\Delta U = -10.5$ kJ and $R = 8.314\ \text{J K}^{-1}\ \text{mol}^{-1}$.

(A)

$-14.45$ kJ

(B)

$-12.98$ kJ

(C)

$10.50$ kJ

(D)

$11.00$ kJ

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Q2.

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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