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ANISH95

  • 3 years ago

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

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  1. BluFoot
    • 3 years ago
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    No clue what you're talking about.

  2. Carl_Pham
    • 3 years ago
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    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
    • 3 years ago
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    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
    • 3 years ago
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    did you get the help you needed?

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