Chemistry Final Help: For the reaction MgO +H2O → Mg(OH)2 ΔH=-38kJ?

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ariel_f21

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If I react 240ml 0.85M MgO with 1.7*10^23 mlcls H20 How much energy will be released by the system?
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Chemistry Final soon please explain this problem with me and tell me which formulas to use. I know that the #moles of MgO is 0.204 and the # moles of H20 is 0.282 but I dont know what to do next, or which equation I should plug these values into.
-Thank You all for the help in advance =]
 
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