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7. AH&quot; for HCl is -92.307 kJ mol- at 25C.
a) Determine AH . at 1000 C. (Heat capacities: HCI, H2, Cl2 = 29.12, 28.824, 33.907 J K- mol&quot; )
b) Determine AH. at 1000 C when the temperature dependence of the molar heat capacities can be ex-
pressed as Cp,m = A + BT + CT2 + DT' where the parameters are
HCI
A (J K- mol-1)
30.67
B (J K ' mol-1)
27.14
26.93
-7. 201 x 10-3
C(JK ' mol-! )
9. 274 x 10-3
33. 84 x 10-3
-1. 246 x 10-5
-1. 381 x 10-5
D (J K 4 mol-])
-3. 896 x 105
-3. 898 x 10-9
7. 645 x 10-9
15. 47 x 10-9

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