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Posted: Fri Feb 03, 2017 10:36 am
Is there anyway to obtain the change in entropy when only change in enthalpy is known? Is there a derivation in which this would be possible, or do you just assume change in enthalpy acts like a heat (q)?
Posted: Fri Feb 03, 2017 10:47 am
To my knowledge, it is not possible to get entropy change from only the enthalpy change. Temperature must be known. If we look at the units, this is already telling because entropy is in J/K while enthalpy is in J (or kJ). q often is the enthalpy change, of which when we divide by temperature, we will get the change in entropy.
Posted: Fri Feb 03, 2017 12:10 pm
At constant pressure, the change in enthalpy will be equivalent to heat (qp).