Calculate the equilibrium partial pressures of the reactants and products if the initial pressures are PPCl5 = 0.5000 atm and PPCl3 = 0.5050 atm.

Question

For the reaction below, K_p = 25.1 at 800 K.

PCl5​(g)PCl3​(g)+Cl2​(g)

Calculate the equilibrium partial pressures of the reactants and products if the initial pressures are P_PCl5 = 0.5000 atm and P_PCl3 = 0.5050  atm.



Answer 1

PCl5​(g)PCl3​(g) + Cl2​(g)

0.5…………..0.5050……0……I

-x……………,.+x……….+x……C

0.5-x……….0.5050+x……x…..E

Kp = (PCl3)(Cl2) / (PCl5)

25.1 = (0.5050+x)(x) / 0.5-x

Solve for x and then fill in the E (equilibrium) line of th ICE table to obtain partial pressures of all species present.