Someone help with this ions and isotopes worksheet?

Had to do something like this last year hope this helps

Explanation:

the one with the ticks are my answers and they're right

consider the reaction below.

 no rx

at 500 k, the reaction is at equilibrium with the following concentrations.

[pci5]= 0.0095 m

[pci3] = 0.020

[ci2] = 0.020 m

what is the equilibrium constant for the given reaction?

0.042

0.42

2.4

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