Influence of pressure on the velocity of chemical reaction

Pressure influences the velocity of reactions strongly if gaseous substances participate the reaction because it directly determines their concentration.

In Mendeleyev - Claperone equation:

pV = nRT

Let's transpose V to the right part of equation, and RT - to the left and consider, that n/V = c:

p/RT = c

Pressure and molar concentration of gas are connected in direct ratio. Therefore in the law of mass actions we can insert p/RT instead of concentration.

Supplementary