Chemistry · 2014
JEE Main · 12 April 2014, Shift 1 · Q37
The entropy (S°) of the following substances are: CH_4( g ) 186.2 J K^-1 mol^-1; O_2 ( g ) 205.0 JK^-1 mol^-1; CO_2( g ) 213.6 JK^-1 mol^-1; H_2 O (…
The entropy (S°) of the following substances are :
$$\begin{aligned}
& \mathrm{CH}_4(\mathrm{~g}) 186.2 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1} \\
& \mathrm{O}_2 \quad(\mathrm{~g}) 205.0 \mathrm{JK}^{-1} \mathrm{~mol}^{-1} \\
& \mathrm{CO}_2(\mathrm{~g}) 213.6 \mathrm{JK}^{-1} \mathrm{~mol}^{-1} \\
& \mathrm{H}_2 \mathrm{O}(\mathrm{l}) 69.9 \mathrm{JK}^{-1} \mathrm{~mol}^{-1}
\end{aligned}
$$
The entropy change ( $\displaystyle \Delta \mathrm{S}^{\circ}$ ) for the reaction
$$\mathrm{CH}_4(\mathrm{~g})+2 \mathrm{O}_2(\mathrm{~g}) \rightarrow \mathrm{CO}_2(\mathrm{~g})+2 \mathrm{H}_2 \mathrm{O}(\mathrm{l}) \text { is : }
$$
Official answer
(2)
$\displaystyle -242.8 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}$
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JEE Main 2014 Chemistry question, with the answer from NTA’s final answer key. Where our answers come from.