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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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buffet55 buffet55
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12 years ago
What effect would be seen if additional nitrogen gas was added to the following reaction:
N2 (g) + 3 H2 (g) ? 2 NH3 (g) + 22 kcal

A) The amount of energy given off will increase
B) the concentration of ammonia would decrease
C) the concentration of hydrogen gas would increase
D) The equilibrium would shift to the left
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wrote...
#1
12 years ago
C
wrote...
#2
12 years ago
The correct answer is A. If you stress a system by adding more N2 gas to the reactants side, the reaction will attempt to adjust itself by shifting the equilibrium toward products. More products means more heat here, since heat is a product. (22 kcal represents heat here, and you can tell its given off because it's on the products side, thus being "produced" by the reaction).
wrote...
#3
12 years ago
answer is A,
increase of N2 means pressure increased,
ratio of reactants and products is 2:1 , so equilibrium shifts to the right.
this means reaction goes in the forward direction, and more heat is produced.
wrote...
#4
12 years ago
if the anwer is A then you are assuming that there is excess H2. otherwise the H2 in the system will get used up and only that amount of energy will be produced which would mean that H2 is your limiting reagent and that adding more N2 would do nothing.. but it looks like the point of this question is equilibrium shift (LaChatliers principle) so it would probly shift the equilibrium to the other side
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