InterviewSolution
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InterviewSolution
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For the complete combustion of ethanol, `C_(2)H_(5)OH(l)+3O_(2)(g) rarr 2CO_(2)(g)+3H_(2)O(l)` the amount of heat produced, as measured in bomb calorimeter, is1364.47 kJ `mol^(-1)` at`25^(@)C`. Assuming idealty the enthalpy of combustion , `Delta_(c) H`, for the reaction will be `( R = 8.314JK^(-1) mol^(-1))`A. `-1350.50 kJ mol^(-1)`B. `- 1366.95kJ mol^(-1)`C. `-1361.95kJ mol^(-1)`D. `-1460 .50 kJ mol^(-1)` |
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Answer» Correct Answer - B Given `DeltaU = - 1364.47 kJ mol^(-1)` `Deltan_(g) = ( n_(p) -n_(r))_("gaseous") = 2-3= -1` `T = 25 +273= 198 K` `DeltaH = DeltaU + Deltan_(g) RT` `= - 1364.47kJ + ( -1)` `( 8.314 xx 10^(-3) kJ K^(-1) mol^(-1))( 298K)` `= - 1364 .47 - 1 xx 8.314 xx 10^(-3) xx 298K` `= - 1364.47 -2477.57 xx 10^(-3)` `= - 1364.47 - 2.477 = - 1366.95kJ mol^(-1)` |
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