why heat capacity integrals required for accurate enthalpy measurements??????

Question

anonymous · Answer

No clue what you're talking about.

anonymous · Answer

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

anonymous · Answer

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!!

anonymous · Answer

did you get the help you needed?