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Chemistry · 2015
JEE Main 2015 · 2015-04-04 Offline · Q35
The following reaction is performed at 298 K. 2 NO ( g )+ O_2( g ) ⇌ 2 NO_2( g ) The standard free energy of formation of NO(g) is 86.6 kJ/mol at 298…
The following reaction is performed at $\displaystyle 298$ K.
$$2 \mathrm{NO}(\mathrm{~g})+\mathrm{O}_2(\mathrm{~g}) \rightleftharpoons 2 \mathrm{NO}_2(\mathrm{~g})
$$
The standard free energy of formation of NO(g) is $\displaystyle 86.6$ kJ/mol at $\displaystyle 298$ K. What is the standard free energy of formation of $\displaystyle \mathrm{NO}_2(\mathrm{~g})$ at $\displaystyle 298$ K? ( $\displaystyle K_p=1.6 \times 10^{12}$ )
Official answer
(4)
$\displaystyle 0.5\left[2 \times 86,600-\mathrm{R}(298) \ln \left(1.6 \times 10^{12}\right)\right]$
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JEE Main 2015 Chemistry question, with the answer from NTA’s final answer key. Where our answers come from.