HELP!?! How to calculate Heat of Reaction??? - Chemistry?

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caleey

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How much energy is liberated when 0.100 mole of H2 at 25°C and 1 atmosphere is combined with enough O2 (g) to make liquid water at the same conditions?

H2(g)+½O2 (g) => H2O(l)+68.3

explaining step-by-step with help a lot..
please and thank you!

also, you don't have to do the whole thing for me, guiding me through would be a lot of help! just tell me if the way you're ending the problem isn't the answer (:
 
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