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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.

$500\ \text{mL}$ of nitrogen gas and $750\ \text{mL}$ hydrogen gas were allowed to react at $1\ \text{bar}$ pressure according to reaction,
$\text{N}_{2(g)} + 3\text{H}_{2(g)} \rightarrow 2\text{NH}_{3(g)}$
What is PV type of work done during reaction?

(A)

$+50\ \text{J}$

(B)

$-50\ \text{J}$

(C)

$+100\ \text{J}$

(D)

$-100\ \text{J}$

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