NEET UG CHEMISTRY MCQ: THERMODYNAMICS

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Application +4 | -1

The enthalpy changes for two reactions are given by the equations.

2C{r_{\left( g \right)}} + \frac{3}{2}{O_{2\left( g \right)}} \to C{r_2}{O_{3\left( g \right)}},\,\,\Delta H = - 1130kJ\,\,\,\,\,\,{C_{\left( g \right)}} + \frac{1}{2}{O_{2\left( g \right)}} \to C{O_{\left( g \right)}},\,\,\Delta H = - 110kJ\,\,\,\,

What is the enthalpy change (in kJ) for the reaction?

3C\left( s \right) + C{r_2}{O_3}\left( s \right) \to 2Cr\left( s \right) + 3CO\left( g \right)

View answer and explanation

Correct option: B

+ 800kJ

Option B (+ 800kJ) is correct because the enthalpy change for the reaction is calculated by manipulating the given equations using Hess's Law.

More Questions from THERMODYNAMICS

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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