required: C6H4(OH)2 + H202 -> C6H4O2 + 2 H20
available:
1. C6H4O2 + H2 -> C6H4(OH)2 delta Hr = -177.4 kJ
2. 2 H20 + H2 -> O2 + 2 H20 delta Hr = -189.0 kJ
3. 1/2 O2 + H2 -> H20 delta Hr = -285.8kJ
your equations are not balanced
2. should (probably) read
2H202 -> O2 + 2 H20
if you don't copy the equations down correctly then you have no chance!
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