Table B: Enthalpy of Formation of Reactants and Products
Substance
Hf (kJ/mol)
BE

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:

it should be p1 v1 = p2 v2