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Entropy is calculated by dividing the heat lost/gained in a reversible reaction divided by the temperature of the system. If this reaction occurs at constant pressure then you can substitute q for delta H, or enthalpy change.
Change in enthalpy, delta H, is equal to heat loss/gained under constant pressure. If there's constant pressure than in the equation delta S=q/T, q can be replaced by delta H. Under these condition, change in entropy would be directly proportional with change in entropy.
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