## ANISH95 2 years ago why heat capacity integrals required for accurate enthalpy measurements??????

1. BluFoot

No clue what you're talking about.

2. Carl_Pham

How are you going to calculate heat from changes in temperature? Surely something like this:$Q = \int d{\rm T} \thinspace m \thinspace C_p({\rm T})$

3. ANISH95

i am talking about enthalpy measurement using the relation$dH=Cp*dT$ and then integrating it over the range of temperature, well acually enthalpy is supposed to be a function of temp. and pressure. at constant pressure if i want to calculate the enthalpy at constant pressure ............. well never mind..!! this was a question in physical chemistry by castellan. i was not able to figure out what might be the answer but now i know the ans.. so u may forget this question.!! the ans is ridiculously simple.. the heat capacity at constant pressure of a substance is not independent of temp. but is a function of temp. so we dont take it as a constant quantity and thus for ACCURATE measurements we use heat capacity integrals.(not from the formula u mentioned carl) but from this formula$Cp=a+bT+cT^2+dT^3+.......$ i hope its a bit clear now// apologies for writing such a long answer!!

4. JeanetteBaker

Find more explanations on OpenStudy