Question

Given the following conditions for five distinct reactions of A + B ---> C

Reaction. Ea. temp. concentration

1. high low 1 mole A and 1 mole B

2 low low 1 moleA and 1 mole B

3 low high 1 mole A and 1 mole B

4 high high 1 mole A and 2 mole B

5 high high 1 mole A and 1 mole B

in each of the following pairs predict which reation of the pair will proceed faster

a)4 and 5:

b) 1 and 3:

Answer 1

a) 4 and 5:

In this case, reaction 4 will be faster becoz rate of reaction will increase with the increse in the concentration of reactant as 2 mole of B is used as compared to reaction 5 at same Ea and temperature

b) 1 and 3:  

Reaction 3 will be faster than reaction 1 because at high temperature activation energy (energy required to convert the reactants in to the products) of reactants will decrease further compared to the reaction 1 which has high activation energy and low temperature resulting in decrese in the reaction rate.