Question

In a reaction \[\ce{2A + P -> A2P}\], the reactant 'A' disappears at ____________.

Options

• half the rate as that of disappearance of P

• same rate as that of disappearance of P

• same rate as formation of A₂P

• twice the rate of formation of A₂P

Answer 1

In a reaction \[\ce{2A + P -> A2P}\], the reactant 'A' disappears at twice the rate of formation of A₂P.

Explanation:

The rate of disappearance of A = `-(Δ["A"])/(Δ"t")`

The rate of disappearance of P = `-(Δ["P"])/(Δ"t")`

The rate of formation of A₂P = `(Δ["A"_2"P"])/(Δ"t")`

The average rate of the reaction

= `-1/2 (Δ["A"])/(Δ"t") = -(Δ["P"])/(Δ"t") = (Δ["A"_2"P"])/(Δ"t")`

∴ `-(Δ["A"])/(Δ"t") = +2 Δ/(Δ"t") ["A"_2"P"]`