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    Calculate delta h of this eq

    calculate delta h of this eq 2N2 + 5o2 -> 2N2O5 giventhis data h2 + 1/2o2 -> h20 and delta h of that is -285.5 n2o5 + h2o -> 2nho3 delta h -76.5 and 1/2n2 + 3/2 o2 + 1/2h2 -> hno3 delta h -170.3
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