The standard enthalpies of formation of $C{O_2}\left( g \right),\,\,{H_2}O\left( l \right)$ and glucose (s) at ${25^{\rm{o}}}\,\,C$ are $ - 400\,\,KJ \cdot mo{l^{ - 1}},\,\, - 300\,\,KJ \cdot mo{l^{ - 1}}$ and $ - 1300\,\,KJ/mol$ respectively. The standard enthalpy of combustion per gram of glucose at ${25^{\rm{o}}}\,\,C$ is

NEET UG CHEMISTRY MCQ: THERMODYNAMICS

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The standard enthalpies of formation of

C{O_2}\left( g \right),\,\,{H_2}O\left( l \right)

and glucose (s) at

{25^\mathrm{o}}\,\,C

are

- 400\,\,KJ \cdot mo{l^{ - 1}},\,\, - 300\,\,KJ \cdot mo{l^{ - 1}}

and

- 1300\,\,KJ/mol

respectively. The standard enthalpy of combustion per gram of glucose at

{25^\mathrm{o}}\,\,C

View answer and explanation

Correct option: C

- 16.11 KJ

Option C (-16.11 KJ) is correct because it is calculated by finding the enthalpy of combustion and dividing by the molar mass of glucose.

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{T_i}

{T_f}

\mathrm{H}_2 \mathrm{O}(\mathrm{s}) \rightarrow \mathrm{H}_2 \mathrm{O}(\mathrm{g})

\mathrm{X}_2 \mathrm{O_4(l}) \longrightarrow 2 \mathrm{XO}_2(\mathrm{g}), \Delta U=2.1 \mathrm{~kcal}, \Delta S=20 \mathrm{~cal} \mathrm{~K}^{-1}

300 \mathrm{~K}

\Delta G