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  • In a bomb calorimeter with heat capacity of <img alt="6.75 \mathrm{~kJ} / \mathrm{K},\ 2 \mathrm{~g}" src="https://entrancecorner.oncodecogs.com/gif.latex?6.75%20%5Cmathrm%7B%7EkJ%7D%20/%20%5Cmathr

In a bomb calorimeter with heat capacity of 6.75 \mathrm{~kJ} / \mathrm{K},\ 2 \mathrm{~g} of oxalic acid was burnt so that the temperature is raised by \mathrm{0.112 \mathrm{~K}}. Calculate the combustion enthalpy of oxalic acid at 27^{\circ} \mathrm{C}.

Option: 1

\mathrm{-245.7 \mathrm{~kJ} / \mathrm{mol}}


Option: 2

\mathrm{-30.27 \mathrm{~kJ} / \mathrm{mol}}


Option: 3

\mathrm{1.38 \mathrm{~kJ} / \mathrm{mol}}


Option: 4

\mathrm{5680.5 \mathrm{~kJ} / \mathrm{mol}}


Answers (1)

best_answer

\mathrm{\mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4(\mathrm{l})+\frac{1}{2} \mathrm{O}_2(\mathrm{~g}) \rightarrow \mathrm{H}_2 \mathrm{O}(l)+2\left (\mathrm{CO}_2(g)\right.}
\mathrm{\begin{aligned} \Delta n_g & =\frac{3}{2} \\ \Delta u_c & =\frac{-0.112 \times 6.75}{2} \times 90 \end{aligned}}
\begin{aligned} & =-34.02 \mathrm{~kJ} / \mathrm{mol} \\ \Delta H & =\Delta U+\Delta n_g R T \end{aligned}
\begin{aligned} & =-34.02+\frac{3}{2} \times \frac{8.314 \times 300}{1000} \\ & =-30.27 \mathrm{~kJ} / \mathrm{mal} \end{aligned}

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shivangi.shekhar

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