Chemistry · 2014
JEE Main · 11 April 2014, Shift 1 · Q39
The molar heat capacity (C_p) of CD_2 O is 10 cals at 1000 K. The change in entropy associated with cooling of 32 g of CD_2 O vapour from 1000 K to…
The molar heat capacity $\displaystyle \left(C_p\right)$ of $\displaystyle \mathrm{CD}_2 \mathrm{O}$ is $\displaystyle 10$ cals at $\displaystyle 1000$ K. The change in entropy associated with cooling of $\displaystyle 32$ g of $\displaystyle \mathrm{CD}_2 \mathrm{O}$ vapour from $\displaystyle 1000$ K to $\displaystyle 100$ K at constant pressure will be : ( $\displaystyle \mathrm{D}=$ deuterium, at. mass $\displaystyle =2 \mathrm{u}$ )
Official answer
(2)
$\displaystyle 23.03$ cal deg $\displaystyle { }^{-1}$
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JEE Main 2014 Chemistry question, with the answer from NTA’s final answer key. Where our answers come from.