The equilibrium constant at 35 0 K for the reaction Br2(g) I2(g) 2IBr(g) has a value of 322. Bromine at an initial pressure of 0. 0500 atm is mixed with iodine at an initial partial pressure of 0. 0400 atm and held at 35 0 K until equilibrium is reached. Calculate the equilibrium pressure of each of the gases.

Partial pressure of Br2 = 0.01158 atm

Partial pressure of I2 =  0.00158 atm

Partial pressure of IBr =0.07684 atm

Explanation:

Step 1: Data given

Temperature = 350 K

K = 322

Initial partial pressure of bromine = 0.0500 atm

Initial partial pressure of iodine = 0.0400 atm

Step 2: The balanced equation

Br2(g) + I2 ⇆ 2IBr(g)

Step 3: The initial pressures

pBr2 = 0.0500 atm

pI2 = 0.0400 atm

pIBr = 0 atm

Step 3: The pressure ate the equilibrium

pBr2 = 0.0500 - X atm

pI2 = 0.0400 -X atm

pIBr = 2X atm

Step 4: Define K

K = (pIBr)² / (pBr2)*(pI2)

Step 5: Calculate X

322 = (2X)² / (0.0500-X)(0.0400-X)

X = 0.03842

pBr2 = 0.0500 - 0.03842 = 0.01158 atm

pI2 = 0.0400 -0.03842 = 0.00158 atm

pIBr = 2*0.03842 = 0.07684 atm

a) decrease

b) increase

c) decrease

Explanation:

a) The density of water decreases as water changes from liquid to steam.

The density of substances are higher when their molecules are very close to each other having strongest bonding forces. When water is change from liquid to steam it means water molecules are not close to each other as they are in liquid state because now water is changed into gaseous form and molecules are further apart from each other. Thus, density goes to decrease.

b)  As the temperature increases, the rate of diffusion of a gas increase.

As temperature increases molecules gets more kinetic energy and rate of diffusion increases.

c) At constant volume, if the temperature of a gas is decreases, its pressure decreases.

According to Gay-Lussac Law,

The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.

Mathematical relationship:

P₁/T₁ = P₂/T₂

As temperature decreases its pressure also goes to decrease and vice versa.