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5. Thermodynamics and thermochemistry — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry5. Thermodynamics and thermochemistry1 Mark
MCQ
The heat of combustion of carbon to $C{O_2}$ is $ - 393.5\,kJ/mol$. The heat released upon formation of $35.2\, g $ of $C{O_2}$ from carbon and oxygen gas is .....$kJ$
  • A
    $ + \,315$
  • B
    $ - \,31.5$
  • ✓
    $ - 315$
  • D
    $ + 31.5$
✓

Answer

Correct option: C.
$ - 315$
(c) $C + {O_2} \to C{O_2}\,\,\Delta H = - 393.5\,KJ/mol$
$44\,gm$ of $C{O_2}$ form by which heat released
$ = - 393.\,5\,kJ$
$\therefore $ $1\,gm$ of $C{O_2}$ form by which heat released $ = - \frac{{393.5}}{{44}}$
$\therefore $ $35.2\,gm$ (given) of $C{O_2}$ form by which heat released
$ = - \frac{{393.5}}{{44}} \times 35.2$ $ = - 315\,kJ$

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