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The molar specific heats C(p) and C(v) o...

The molar specific heats `C_(p) and C_(v)` of an ideal gas are expressed in the unit of `cal cdot mol^(-1) cdot^(@)C^(-1)`. But R is expressed in `J cdot mol^(-1) cdot^(@)C^(-1)`. Write down the relation between `C_(p) and C_(v)`.

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R `J cdot mol^(-1) cdot^(@)C^(-1) = R/J cal cdot mol^(-1) cdot^(@)C^(-1)`. So the relation `C_(p) - C_(v) = R` is to be written as `C_(p) - C_(v) = R/J`, where J = Joule.s equivalent.
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