Question

Write the rate law for the reaction 2A + B → C if the reaction

Answer 1

Answer:

1.   $R=k[A]^1[B]^2$

2.  $R=k[B]^1$

3.  $R=k[A]^0[B]^0=k$

4.  $R=k[A]^1[B]^{-1}$

Explanation:

Rate law says that rate of a reaction is directly proportional to the concentration of the reactants each raised to a stoichiometric coefficient determined experimentally called as order.

(1) is second order in B and overall third order.

2A + B → C

Order of the reaction = sum of stoichiometric coefficient

= x + 2 = 3

x = 1

Rate of the reaction =R

$R=k[A]^1[B]^2$

(2) is zero order in A and first order in B.

2A + B → C

Rate of the reaction =R

$R=k[A]^0[B]^1=k[B]^1$

Order of the reaction = sum of stoichiometric coefficient

= 0 + 1 = 1

(3) is zero order in both A and B .

2A + B → C

Order of the reaction = sum of stoichiometric coefficient

= 0 + 0 = 0

Rate of the reaction =R

$R=k[A]^0[B]^0=k$

(4) is first order in A and overall zero order.

2A + B → C

Order of the reaction = sum of stoichiometric coefficient

= 1 + x = 0

x = -1

Rate of the reaction = R

$R=k[A]^1[B]^{-1}$