energy in reactions chemistry? - Freemason Hirams Travels Masonic Forums

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03-21-2008, 06:56 AM

Melanie?

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energy in reactions chemistry?

I have a test tomorrow, how do I do these?

According to the reaction:
H2 + 1/2 O2 ® H2O DH = -241.8 kJ
190.7 g of H2 is burned in air to make H2O. How much heat is given off?

According to the reaction:
N2 + 1/2 O2 ® N2O DH = 81.6 kJ
190.7 g of N2 is burned in air to make N2O. How much heat is absorbed?

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