Danny H.

asked • 09/23/22

2 AsF5 (g) = 2 As (s) + 5 F2 (g)

If you put 2.065 M AsF5 and 0.218 M F2 along with excess As in a 2.000 L container at 358.2 C, which way will it shift?

J.R. S.

tutor
Do we know the equilibrium constant? I think we need that information.
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09/23/22

Danny H.

We assume the equilibrium is constant.
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09/24/22

J.R. S.

tutor
Not the equilibrium. The equilibrium constant, Kc or Kp. Not sure we can solve the problem without that info. The way I read the problem, the amounts given are INITIAL concentrations. Therefore we need to find the concentrations at equilibrium, which we can't do without knowing Kc or Kp.
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09/24/22

1 Expert Answer

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Richard P. answered • 09/24/22

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The heat of formation of AsF5 is large ~ 850 kJ/mole. The entropic contribution ~ RT ln(5/2) is quite a bit less,

so the reaction shifts to the left

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J.R. S.

tutor
How is the person answering this question supposed to know the ∆Hf? If we had the Kc or Kp, couldn't we also get the answer ?
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09/25/22

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