A quantity of HI was sealed in a tube, heated to 425°C and held at this temperature until equilibrium was reached. The concentration of Hl in the tube at equilibrium was found to be
0.0706 mol/L. Calculate the equilibirum concentration of H2 (and 12). For the gas-phase
reaction,
H2 + 2 = 2HIKc = 54.6 at 425°C
O a. 1.17 x 10-3M
O b. 2.34 x 10-3M
c. 9.55 x 10-3M
d. 1.85 x 10-4 M
e. 4.78 x 10 PM

The equilibrium concentration of H₂ : c. 9.55 x 10⁻³ M

Further explanation

Given

Kc = 54.6 at 425°C

The concentration of Hl = 0.0706 mol/L

Required

The equilibrium concentration of H₂ (and I₂)

Solution

[H₂][I₂]=[H₂]²

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