Give Hr values for each of the following reactions from the information below.
Hf (HCl(g))= -92.31 kJ.mol-1
H-Cl bond enthalpy = +431 kJ.mol-1
O-H bond enthalpy = +463 kJ.mol-1
Hf (H2O(g))= -241.8 kJ.mol-1
(a)2H(g)+ O(g) H2O(g)
(b)H2(g)+ Cl2(g) 2HCl(g)
(c)H(g)+ Cl(g) HCl(g)
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