Answer:
Given moles of SO3=0.76 mol and volume=5 L
Therefore [SO3]=moles/L=0.76 mol/5L=0.152 M.
Moles of O2 at equilibrium=0.19 mol then
[O2]=0.19 mol/5L=0.038 M.
Now ICE table,
Reaction: 2SO3(g) <------> 2SO2(g) + O2(g)
Initial 0.152 0 0
Change -2x +2x +x
Equilibrium 0.152-2x 2x x
Given [O2] at equilbrium=x=0.038 M.
Therefore, [SO2]=2x=2x0.038=0.076 M
[SO3]=0.152-2x=0.152-0.076=0.076 M
Kc=[SO2]2[O2]/[SO3]2
Kc=(0.076)2(0.038)/(0.076)2
Kc=0.038 or Kc=3.8 x 10-2.
Thanks
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