Can’t figure out these two questions! Help !! The equilibrium constant is 56 for

Question

Can’t figure out these two questions! Help !! The equilibrium constant is 56 for the following reaction at 250°C. If 2.0 moles of HI are put into a 2.00 L container and allowed to reach equilibrium, what will be the equilibrium concentration of H27 2HI(g) H2g) + 12(8) 0.063 3.74 14.96 1.50 0.47 QUESTION 12 At a certain temperature Kc 55 and a reaction vessel contains a mixture with the following concentrations: [SO3] 0.85 M, [NOJ 1.2 M, ISO2]-1.5 M and [NO2] 2.0 M. Which of the following statements concerning the reaction and the reaction quotient, Q, is false? sO3(g) +NO(g)SO2(8) NO28)

Explanation / Answer

H2(g) + I2(g) -------> 2HI(g)
I    0        0              2
c    x        x              -2x
E    x        x              2-2x
   [H2] = x/2
   [I2]   = x/2
   [HI]   = 2-2x/2

    Kc   = [HI]^2/[H2][I2]^2
    56   = (2-2x)^2/x*x
    7.48 = 2-2x/x
   7.48x = 2-2x
     x = 0.21
[H2]   = x/2   = 0.21/2   = 0.105M
The conc of H2 = 0.105M
12.
   SO3(g) + NO(g) ------> SO2(g) + NO2(g)
    Qc   = [SO2][NO2]/[SO3][NO]
         = 1.5*2/0.85*1.2 = 2.94
Kc = 55
Kc>Qc true
Q>Kc false

plz any doubt comment on BOX

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