InterviewSolution
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InterviewSolution
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At very low temperatures, heat capacity of a solid is proporional to `T^(3)` and can be written as: `C_(P) = alphaT^(3)` where `alpha = 3xx10^(8)J mol^(-1) K^(-1)`. What is the change in enthalpy when a solid is heated from `0K` to `300K`? |
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Answer» Using `DeltaH = int_(T_(1))^(T_(2)) C_(P) dT = int_(T_(1))^(T_(2)) alpha T^(3) dT` `= (alpha)/(4) [T_(2)^(4) - T_(1)^(4)]` `= (alpha)/(4) [(300)^(4) - 0] = 60.75 J mol^(-1)` |
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