At a particular temperature the equilibrium constant for the reaction: H2(g) + F2(g) ⇔ 2HF(g) is...

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Chemistry

At a particular temperature the equilibrium constant for thereaction: H2(g) + F2(g) ⇔ 2HF(g) is K = 25.0. A reaction mixture ina 10.00-L flask contains 0.33 moles each of hydrogen and fluorinegases plus 0.30 moles of HF. What will be the concentration of H2when this mixture reaches equilibrium?

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3.7 Ratings (537 Votes)

   H2(g)   + F2(g)    <===> 2HF(g)

initial          0.33/10 = 0.033 M      0.033 M                   0.03 M

change          x                                         x                            2x

equil             0.033-x                         0.033 - x                       0.03+2x

Reaction quotient(Q) = [HF]^2/[H2][F2]

                                           = 0.03^2/(0.033^2)

                                           = 0.826

   K = 25

Q

at equilibrium

                  K = [HF]^2/[H2][F2]

                  25 = (0.03+2x)^2/(0.033-x)^2

     x = 0.02

concentration of H2 at equil = 0.033 - x

                                                 = 0.033- 0.02 = 0.013 M


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