Question

For the reaction \[\ce{H2_{(g)} + I2_{(g)} ⇌ 2HI_{(g)}}\], the average rate of reaction is expressed as ____________.

Options

• `-(Δ["I"_2])/(Δ"t") = -(Δ["H"_2])/(Δ"t") = (Δ["HI"])/(2Δ"t")`

• `(Δ["I"_2])/(Δ"t") = (Δ["H"_2])/(Δ"t") = (Δ["HI"])/(2Δ"t")`

• `(Δ["H"_2])/(Δ"t") = (Δ["I"_2])/(2Δ"t") = -(Δ["HI"])/(Δ"t")`

• `-(Δ["I"_2])/(Δ"t") = -(Δ["H"_2])/(2Δ"t") = (Δ["HI"])/(Δ"t")`

Answer 1

For the reaction \[\ce{H2_{(g)} + I2_{(g)} ⇌ 2HI_{(g)}}\], the average rate of reaction is expressed as `underline(-(Δ["I"_2])/(Δ"t") = -(Δ["H"_2])/(Δ"t") = (Δ["HI"])/(2Δ"t"))`.

Explanation:

The average rate of a reaction is calculated by dividing the change in reactant or product concentration by the time interval during which the change occurs.