Explore BrainMass
Share

# shift of equilibrium when the volume of container decreases

This content was STOLEN from BrainMass.com - View the original, and get the already-completed solution here!

Question 4
For which of the following systems at equilibrium will shift to produce more products when the volume of the container is decreased?
i) H2(g) + I2(g) 2 HI(g)
ii) 2 NO2(g) N2O4(g)
iii) PCl5(g) PCl3(g) + Cl2(g)
iv) ZnO(s) + CO2(g ZnCO3(s)
explain

a. ) none of them
b. ) i and ii
c. ) ii and iv
d. ) iii and iv
e. ) all of them

https://brainmass.com/chemistry/le-chatelier-s-principle/shift-equilibrium-volume-container-decreases-208332

#### Solution Preview

The change of the volume of the contatiner effects the partial pressure of the gas in the container.
PV = nRT
so the decrease in volume indicates the increase of the partial pressure of the gas.
According to Le Chatelier's principle, the equilibrium shifts to partially counter-act the imposed change.

Let's take a look at ii) 2NO2 (g) --> N2O4
Because ...

#### Solution Summary

It explains how the systems of equilibrium shifts when the volume of the container decreased.

\$2.19

## Equilibrium and Reactions

Question 1
At 100oC, the equilibrium constant, KC, for the reaction COCl2(g) ?---? CO(g) + Cl2(g) has a value of 2.19 x 10-10. Is the following mixture at equilibrium? If not, indicate the direction in which the reaction must proceed to achieve equilibrium.
[COCl2] = 5.00 x 10-2 M, [CO] = [Cl2] = 3.31 x 10-6 M

Question 2
Consider the following equilibrium:
2 SO2(g) + O2(g)?----? 2 SO3(g), ?H = -198.2 kJ
Choose the TRUE statement(s) from among the following:
i) The equilibrium constant expression is KC = [SO3]2/[SO2]2[O2].
ii) Reducing the volume of the container would shift the equilibrium to the right.
iii) Adding more O2 would shift the equilibrium to the right.
iv) Raising the temperature would shift the equilibrium to the right.
v) Changing the temperature would affect the magnitude of the equilibrium constant.

Question 3
For which of the following systems at equilibrium will shift to produce more products when the volume of the container is decreased?
i) H2(g) + I2(g) ?----? 2 HI(g)
ii) 2 NO2(g) ?----? N2O4(g)
iii) PCl5(g) ?----? PCl3(g) + Cl2(g)
iv) ZnO(s) + CO2(g) ?----? ZnCO3(s)

Question 4
The equilibrium constant Kp = 0.90 for the following reaction in the gas phase:
H2O(g) + Cl2O(g) ?----? 2HOCl(g).
Calculate the equilibrium pressure of HOCl in the reaction vessel if the initial pressures of H2O and Cl2O are both 0.50 atm.

Question 5
A 10.0 gram sample of solid PCl5 was placed in a 1.00 litre vessel and heated to 250 oC. All components are in the gas phase at this temperature. Kp = 0.70 at 250 oC. Calculate the total pressure in the reaction vessel at equilibrium.
PCl5(g) ?----?PCl3(g) + Cl2(g).

Question 6
Solid silicon reacts with chlorine gas to form gaseous SiCl4 at elevated temperatures. When the reaction is started with 0.10 mol Si and 0.20 mol Cl2 in a one-liter flask, 0.050 mol SiCl4 are obtained. The equilibrium constant, KC is:

Question 7
Consider the following reaction in the gas phase: H2 + I2 ?----?2 HI. At some temperature, the equilibrium constant (Kc) is 4.0. The reaction is started with equimolar quantities of H2 and I2. When equilibrium is established, 0.20 mol HI is present. How much H2 was used to start the reaction?

Question 8
What is the relationship of the equilibrium constants for the following two reactions?
(1) 2NO2(g) ?----?N2O4(g)
(2) N2O4(g) ?----?2NO2(g)

Question 9
A catalyst serves to:

a. ) shift the equilibrium to the left.
b. ) shift the equilibrium to the right.
c. ) shift the equilibrium to the right or the left depending on the reaction.
d. ) speed up a reaction.
e. ) slow down a reaction.

Question 10
The equilibrium constant, Kp , has a value of 6.5 × 10-4 at 308 K for the reaction of chlorine with nitric oxide.
2NO(g) + Cl2(g) ?----? 2NOCl(g)
What is the value of Kc?

View Full Posting Details