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The difference between the reaction enthalpy change \( \left(\Delta_{\mathrm{r}} \mathrm{H}\right) \) and reaction internal energy change \( \left(\Delta_{\mathrm{r}} \mathrm{U}\right) \) for the reaction :
\( P \) \( 2 \mathrm{C}_{6} \mathrm{H}_{6}(\ell)+15 \mathrm{O}_{2}(\mathrm{~g}) \rightarrow 12 \mathrm{CO}_{2}(\mathrm{~g})+6 \mathrm{H}_{2} \mathrm{O}(\ell) \) at \( 300 \mathrm{~K} \) is \( \left(\mathrm{R}=8.314 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}\right) \)

W.
(1) \( 0 \mathrm{~J} \mathrm{~mol}^{-1} \)
(2) \( 2490 \mathrm{~J} \mathrm{~mol}^{-1} \)
(3) \( -2490 \mathrm{~J} \mathrm{~mol}^{-1} \)
(4) \( -7482 \mathrm{~J} \mathrm{~mol}^{-1} \)
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