posted by Richard

Consider the following chemical reaction:

H2 (g) + I2 (g) <> 2HI (g)

At equilibrium in a particular experiment, the concentrations of H2, I2, and HI were 0.15 M,
0.033 M, and 0.55 M, respectively. The value ofKeq for this reaction is

I solved by:

0.55 M^2 (bc of 2 on 2HI)
-----------------
(0.033 M)(0.15 M)

= 61

1. DrBob222

Looks good. Congrats. I would have put the squared sign over the 0.55 since it's the number you are squaring and not the unit. Technically, although molarity is what we substitute, Keq has no units. (Because the numbers that go there are activities. We use molarities in 99% of the problems you will see).

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