For which one of the following equations is Δ H_ react ^ equal to Δ H_f^ for the product?

Correct answer: C. Xe_ (g) +2 ~F_ 2(g) arrow XeF_ 4(g) Enthalpies of formation of elementary substances Xe and (F_2) are taken as zero. For (c) (Δ H_ reaction ^ ) (=Δ H_f^ (XeF_4)-[Δ H_f^ (Xe)+2 Δ H_f^ (F_2)]) Thus, (Δ H^ ) reaction (=Δ H^ _ f (XeF_4))

NEET 2003

Exam: NEET
Year: 2003
Subject: Chemistry
Chapter: Thermodynamics (C)

NEET 2003 · Chemistry · Thermodynamics (C)

For which one of the following equations is Δ H_ react ^ equal to Δ...

For which one of the following equations is

\Delta

\mathrm{H}_{\text{react }^{

\circ}

equal to

\Delta

\mathrm{H}_f^{\circ}

for the product?

Options

A $\mathrm{N}_{2(g)}+\mathrm{O}_{3(g)} \rightarrow \mathrm{N}_2 \mathrm{O}_3(g)$
B $\mathrm{CH}_{4(g)}+2 \mathrm{Cl}_{2(\mathrm{~g})} \rightarrow \mathrm{CH}_2 \mathrm{Cl}_{2(l)}+$ $2 \mathrm{HCl}_{(g)}$
C $\mathrm{Xe}_{(g)}+2 \mathrm{~F}_{2(g)} \rightarrow \mathrm{XeF}_{4(g)}$
D $2 \mathrm{CO}_{(g)}+\mathrm{O}_{2(g)} \rightarrow 2 \mathrm{CO}_{2(g)}$

Correct answer

C. $\mathrm{Xe}_{(g)}+2 \mathrm{~F}_{2(g)} \rightarrow \mathrm{XeF}_{4(g)}$

Step-by-step solution

Enthalpies of formation of elementary substances Xe and (\mathrm{F}_2) are taken as zero. For (c) (\Delta H_{\text{reaction }^{\circ}) (=\Delta H_f^{\circ}\left(\mathrm{XeF}_4\right)-\left[\Delta H_f^{\circ}(\mathrm{Xe})+2 \Delta H_f^{\circ}\left(\mathrm{F}_2\right)\right]) Thus, (\Delta \mathrm{H}^{\circ}) reaction (=\Delta \mathrm{H}^{\circ}{ }_{\mathrm{f}}\left(\mathrm{XeF}_4\right))

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