Chemistry experts, please help?

Kay · #1 (**permalink**) 03-30-2008, 11:57 PM

How much heat evolved when 275 g of ammonia gas condenses to a liquid at its boiling point?
How would answer this? 0_0
thank you.

devilkidjin · #2 (**permalink**) 03-30-2008, 11:58 PM

you know the mass
so get the moles

by knowing the heat of vaporization (get from tables or internet for next time)
23.35 kj/mol

multiply the heat of vaporization with moles calculated
to get heat (kj)

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