Chemistry

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Clapeyron equation: dp/dT = ΔS / ΔV
My textbook says, for fusion/melting reactions: dp/dT = ΔH / (T ΔV)

this implies that T * ΔS = ΔH.

I know T * ΔS = q and at constant pressure, that equals H, but the dp/dT reaction is not at constant pressure. Please explain. Thanks!

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