1)The equilibrium constant for the reaction 2SO2(g) + O2(g) 2SO3(g) is 5.3 × 102

Question

1)The equilibrium constant for the reaction 2SO2(g) + O2(g) 2SO3(g) is 5.3 × 102 at a certain temperature. Determine the equilibrium concentration of sulfur trioxide [SO3], if the equilibrium concentrations of sulfur dioxide [SO2] and oxygen [O2] are 0.0491 M and 0.077 M, respectively.

2) The equilibrium constant Kc for the equation

2H2(g) + CO(g) CH3OH(g)

is 27 at a certain temperature. If there are 1.49 × 102 moles of H2 and 5.97 × 103 moles of CH3OH at equilibrium in a 6.01L flask, what is the concentration of CO?

Explanation / Answer

Ans 1 :

The equillibrium constant for the reaction is given as :

kc = [SO3]2 / [SO2]2 / [O2]

So putting all the values :

5.3 x 102 = [SO3]2 / (0.0491)2 (0.077)

[SO3] = 0.3137 M

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