500 mL of He at 98 kPa expands to 750 mL. Find P2.

0.65atm or 65.3kPa

Explanation:

Given parameters:

Initial volume of He  = 500mL

Initial pressure  = 98kPa, this gives 0.967atm

Final volume  = 750mL

Unknown:

Final pressure  = ?

Solution:

A good grasp of Boyle's law should suffice here. The law states that:

 "the volume of a fixed mass of gas varies inversely as the pressure changes if the temperature is constant".

            Mathematically;

                P₁ V₁  = P₂ V₂

where P and V are pressure and volume

           1 and 2 are the initial and final states;

  Now, solve for the unknown P₂;

             0.967 x 500  = P₂ x 750

                   P₂  = 0.65atm or 65.3kPa

if the concentration of products is decreased, the equilibrium will shift toward the products). add an inert gas (one that is not involved in the reaction) to the constant-volume reaction mixture: this will increase the total pressure of the system, but will have no effect on the equilibrium condition.

explanation: