At very low termperatures the molar specific heat of many, Ask an Expert

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At very low termperatures the molar specific heat of many solids is approximately Csubv=AT^3..For alymninum, A=3,15 times 10^-5. Find the entropy change for 4 mol of aluminum when its temperature is raised from 5K to 10K. how do we know that this is constant volume?

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