ThermochemistryHard
Question
The molar heat capacities of A, B and C are in the ratio 1:2:3. The enthalpy change for the reaction A + B → C at temperature T1 is ΔH1. Assuming that the heat capacities do not change with temperature, the enthalpy change, ΔH2, at temperature T2 (T2 >T1) will be
Options
A.greater than ΔH1
B.equal to ΔH1
C.less than ΔH1
D.greater or less than ΔH1, depending on the values of T2 and T1
Solution
$\frac{\Delta H_{2} - \Delta H_{1}}{T_{2} - T_{1}} = \Delta\left( C_{P} \right) = (3x) - (x + 2x) = 0 \Rightarrow \Delta H_{2} = \Delta H_{1}$
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