Question

2 H2O2 (g) = 2 H2O (g) + O2 (g) + heat

Predict whether each of the following changes would favor a shift left, right or have no effect

a) removal of O2

b) addition of H2O

c) Addition of a catalyst

d) an increase in temperature

e) a decrease in the pressure of the entire system

f) is the reaction above endothermic or exothermic

Answer 1

a. By the removal of O2, there is a decrease in the concentration of products, so the equilibrium shifts from left to right.

b. addition of H2O, increases the concentration on product side so the equilibrium moves from right to left.

c. No change in the equilibrium by the addition of catalyst

d. an increase in temperature, the equilibrium shifts from right to left, because the backward reaction is the endothermic reaction

e. by the decrease of pressure, the equilibrium will shifts in a direction of from lower number of moles to higher number of moles. So the equilibrium will shifts from left to right

f. the above reaction is exothermic because it releases energy