Question

A mixture of co(g) and h2(g) is pumped into a previously evacuated 2l reaction vessel the total pressure of the reaction system is 1.2 atm at equilibrium. what will be the total pressure of the system if the volume of the reaction vessel is reduced to 1 l at constant temperature?

Answer 1

Answer is: total pressure of the system is 2.4 atm.

Boyle's Law (the pressure volume law): volume of a given amount of gas held  varies inversely with the applied pressure when the temperature and mass are constant.

p₁V₁ = p₂V₂ (the product of the initial volume and pressure is equal to the product of the volume and pressure after a change).

1.2 atm · 2 L = p₂ · 1 L.

p₂ = 1.2 atm · 2 L / 1 L.

p₂ = 2.4 atm.

When pressure goes up, volume goes down.  

When volume goes up, pressure goes down.  

Answer 2

Pressure is inversely proportional to volume of gas under the same conditions of temperature and number of moles:
So by decreasing volume pressure will increases:
The pressure will be greater than 1.2 but less than 2.4 atm