MCQ
The values of heat of formation of $S{O_2}$ and $S{O_3}$ are $ - 298.2\,kJ$ and $ - 98.2\,kJ$. The heat of reaction of the following reaction will be.....$kJ$

$S{O_2} + \frac{1}{2}{O_2} \to S{O_3}$

  • A
    $ - 200$
  • B
    $ - 356.2$
  • $ + 200$
  • D
    $ - 396.2$

Answer

Correct option: C.
$ + 200$
(c)$S + {O_2} \to S{O_2}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\Delta H = - 298.2\,\,kJ$….$(i)$
$S{O_2} + \frac{1}{2}{O_2} \to S{O_3}\,\,\,\,\,\Delta H = - 98.2\,\,kJ$….$(ii)$
eq. $(i) -(ii) $ and find the required result.

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