InterviewSolution
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InterviewSolution
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What is the value of change in internal energy at 1 atm in the process? `H_(2)O(l,323K)rarrH_(2)O(g,423K)` Given : `C_(v,m)(H_(2)O,l)=75.0JK^(-1) mol^(-1):" "C_(p,m)(H_(2)O,g)=33.314JK^(-1)mol^(-1)` `DeltaH_(vap)"ar 373 K"=40.7KJ//mol`A. `52.91 kJ//mol`B. `43086 kJ//mol`C. `42.6kJ//mol`D. `49.6kJ//mol` |
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Answer» Correct Answer - C `H_(2)O(l,323 K) overset(Delta U_(1))rarr H_(2)O(l, 373 K)` , `Delta U_(2)` `H_(2)O(g, 323K) overset(Delta U_(3))larr H_(2)O(g, 373 K)` `C_(V, m) (H_(2)O, g) = 33.314-8.314` `Delta U_(2) = Delta n_(g)RT = 376`, `Delta U_("total") = Delta U_(1) + Delta U_(2) + U_(3)` `= C_(v, m)(l)Delta T+Delta U_(vap) + C_(vap) + C_(vm)(g) Delta T` `= (75 xx 50)/(1000) + 37.6 + (25 xx 50)/(1000) = 42.6 kJ//mol` |
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