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The entropy versus temperature plot for ...

The entropy versus temperature plot for phases `alpha and beta` at 1 bar pressure is given.
`S_T and S_0` are entropies of the phases at temperatures `T and 0 K`, respectively.

The transition temperature for `alpha` to `beta` phase change is `600 K` and `C_(p,beta)-C_(p,alpha)=1 J mol^(-1) K^(-1)`. Assume `C_(p,beta)-C_(p,alpha)` is independent of temperature in the range of `200` to `700 K. C_(p,alpha) and C_(p,beta)` are heat capacities of `alpha and beta` phases, respectively
The value of enthalpy change, `H_(beta) − H_(alpha)` (in `J mol^(−1)`), at 300 K is ___.

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