4) From the data in the table below, calculate $\Delta_rH°$ and $\Delta_rU°$ (in kJ/mol) for the reaction:
C (s,graphite) + H₂O (g) → CO (g) + H₂ (g)
at a) 298 K and at b) 413 K.
(Assume all heat capacities to be constant over the temperature range of interest. Assume
perfect gas behavior.)
Standard enthalpies of formation of inorganic and
organic compounds at 298 K
$\Delta_fH°$ (kJ·mol⁻¹) $C_p^°$ (J·K⁻¹·mol⁻¹)
H₂O(l)
-285.83
75.291
H₂O(g)
-241.82
33.58
CO(g)
-110.53
29.14
H₂(g)
0
28.824
H(g)
217.97
20.784
C(s,graphite)
0
8.527
C(g)
716.68
20.838
C₂(g)
831.90
43.21