# Problem: A 1.0 liter container holds PCl3(g), Cl2(g), and PCl5(g) in equilibrium at 298 K.PCl3(g) + Cl2(g) ⇌ PCl5(g)       ∆H = -87.9 kJ         Kp = 3.3 x 106Which of the following changes will increase the numerical value of Kp?W. Compress the entire system to 0.50 literX. Expand the entire system to 2.0 LiterY. Raise the temperature to 323 K.Z. Lower the temperature to 273 K.A. Y onlyB. W and Y onlyC. Z onlyD. X and Z onlyE. W and Z only

###### FREE Expert Solution

We are asked which following changes will increase the numerical value of Kp

When dealing with equilibrium and Kp:

Kp → equilibrium units in terms of pressure
Kp is an equilibrium expression:

$\overline{){{\mathbf{K}}}_{{\mathbf{p}}}{\mathbf{=}}\frac{\mathbf{products}}{\mathbf{reactants}}}$

only gaseous species are included in the equilibrium expression
▪ the coefficient of each compound in the reaction equation will be the exponent of the pressures in the equilibrium expression

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###### Problem Details

A 1.0 liter container holds PCl3(g), Cl2(g), and PCl5(g) in equilibrium at 298 K.

PCl3(g) + Cl2(g) ⇌ PCl5(g)       ∆H = -87.9 kJ         Kp = 3.3 x 106

Which of the following changes will increase the numerical value of Kp?

W. Compress the entire system to 0.50 liter

X. Expand the entire system to 2.0 Liter

Y. Raise the temperature to 323 K.

Z. Lower the temperature to 273 K.

A. Y only

B. W and Y only

C. Z only

D. X and Z only

E. W and Z only