Chemistry · 2021
JEE Main · 25 February 2021, Shift 1 · Q53
The reaction of cyanamide, NH_2 CN_( s ) with oxygen was run in a bomb calorimeter and Δ U was found to be -742.24 kJ mol^-1. The magnitude of Δ…
The reaction of cyanamide, $\displaystyle \mathrm{NH}_2 \mathrm{CN}_{(\mathrm{s})}$ with oxygen was run in a bomb calorimeter and $\displaystyle \Delta \mathrm{U}$ was found to be $\displaystyle -742.24 \mathrm{~kJ} \mathrm{~mol}^{-1}$. The magnitude of $\displaystyle \Delta \mathrm{H}_{298}$ for the reaction
$$\mathrm{NH}_2 \mathrm{CN}_{(\mathrm{s})}+\frac{3}{2} \mathrm{O}_{2(\mathrm{~g})} \rightarrow \mathrm{N}_{2(\mathrm{~g})}+\mathrm{O}_{2(\mathrm{~g})}+\mathrm{H}_2 \mathrm{O}_{(\mathrm{l})}
$$
is \_\_\_\_kJ. (Rounded off to the nearest integer)
[Assume ideal gases and $\displaystyle \mathrm{R}=8.314 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}$ ]
Official answer
741
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JEE Main 2021 Chemistry question, with the answer from NTA’s final answer key. Where our answers come from.