InterviewSolution
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InterviewSolution
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The different in the work done when one mole of `Al_(4)C_(3)(s)` reacts with water in a closed vesselat `27^(@)C` against atmospheric pressure and that in an open vessel under the same conditions isA. greater in the open vessel by 600 calB. greater in the closed vessel by 600 calC. greater in the open vessel by 1800 calD. greater in the closed vessel by 1800cal |
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Answer» Correct Answer - C Reaction occuringis `:` `underset(1 mol)(Al_(4)C_(3) (s))+ 12 H_(2)O(l) rarr 4Al(OH)_(3) +underset(3 mol)(3CH_(4))` When the vessel is closed,volume `=` constant , i.e., `DeltaV = 0`.Hence,`w=- PDeltaV =0` When vessle is open, initial volume, `V_(1) =0` ( as no gas is present) Final volume , `V_(2) = `Volume of3 mole of `CH_(4)` `PV_(2) = nRT` `:.V_(2)= (nRT)/(P)` `:. w = - P(V_(2)-V_(1))= -PV_(2)` `= - P xx(nRT)/(P) = - nRT` `= - 3 xx 2 xx 300 = - 1800 cal` i.e., work isdone by the system. |
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