uestion 9 of 20 Sapling Learning macmillan learning At a cer

uestion 9 of 20 Sapling Learning macmillan learning At a certain temperature, 0.660 mol of SO3 is placed in a 4.50-L container. 2503(g) 2502(g) +0,(g) At equilibrium, 0.110 mol of O2 is present. Calculate Ke Number

Solution

2SO3_(g) <----------> 2SO2_(g) + O2_(g)   

initially [SO3] = 0.660 / 4.50 = 0.147 M

at equilibrium

[O2] = 0.110 / 4.50 = 0.0244 M

[SO2] = 0.0244 x 2 = 0.0488 M

[SO3] = 0.147 - 0.0488 = 0.0982 M

Kc = [SO2]²[O2] / [SO3]²

Kc = [0.0488]² [0.0244] / [0.0982]²

Kc = 5.81 x 10^-5 / 0.00964

Kc = 6.03 x 10^-3