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Topic: A tricky question!  (Read 3280 times)

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Offline jalen

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A tricky question!
« on: October 19, 2007, 11:25:35 PM »
Calculate the enthalpy change of the following reaction between nitrogen gas and oxygen gas, given thermochemical equations (1),(2),and(3).
(1) 2H2(g) + O2(g) ---> 2H2O(l)               H=-572KJ
(2) N2O5 (g) + H2O(l)     --->2HNO3 (l)             H=-77KJ
(3)1/2 N2 (g) + 3/2 O2 (g) +1/2 H2 (g) ---> HNO3 (l)        H=-174KJ
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Offline Borek

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Re: A tricky question!
« Reply #1 on: October 20, 2007, 04:45:09 AM »
Please read forum rules. Show what you did.
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Offline enahs

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Re: A tricky question!
« Reply #2 on: October 20, 2007, 10:22:44 AM »
And look in your book for Hess's Law.
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