How much heat must be absorbed to evaporate 14 g of NH3(ammonia) from liquid to gas state at −33 °C...
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How much heat must be absorbed to evaporate 14 g of NH3(ammonia) from liquid to gas state at −33 °C...

[From: ] [author: ] [Date: 11-12-13] [Hit: ]
m = mass,q = 19320 Joules is the answer.......
How much heat must be absorbed to evaporate 14 g of NH3(ammonia) from liquid to gas state at −33 °C (condensation point)? Heat of condensation for NH3 = 1380 J/g

i have no idea where to even start so please some one explain to me how to do this problem

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Well, all it has to do is boil, so the energy only goes into boiling the ammonia:

q = L * m, where q = heat absorbed or lost, m = mass, L = heat of condensation
q = (1380 J/g) * (14 grams)
q = 19320 Joules is the answer.
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