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Variation of
H with T
From one may define c_{p}, the heat capacity at constant pressure as: ………………………………..(eqn. 1) NOTE: More details on c_{v} and c_{p}
may be found here.
The variation of H with T The variation of H with T may hence be studied by solving the differential equation above (i.e. by integration). We shall do this at two levels (1) Elementary level
Assuming c_{p} is constant in the temperature region of interest, i.e. for T in (T_{1}, T_{2}),.(2) Higher level of complexity If T_{2} is very different from T_{1} than the approximation that c_{p} is constant in the temperature region of interest cannot be made. Instead we approximate c_{p}(T) as a polynomial in T, i.e.: The variation of DH (or DH_{R}) with T  applications to reactions. In analogy to eqn. 1, we may write: …………………… (KIRCHOFF's EQN.)
Applications Example 1:

