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Calculate the enthalpy change for the reaction: 
2H2(g) + O2(g) → 2H2O(l) 
using Hess's law given the following reactions: 

2H2(g) + O2(g) → 2H2O(g)      ΔH1 = -483.6 kJ/mol 

2H2O(g) → 2H2O(l)           ΔH2 = -40.7 kJ/mol
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<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

<|end_of_thought|>

<|begin_of_solution|>

The answer is 42.

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