the table shows the concentration of a reactant in the reaction mixture over a period of time. reactant concentration time concentration 0 s 1.8 m 210 s 1.2 m 450 s 0.8 m 580 s 0.6 m 720 s 0.4 m what is the average rate of the reaction over the entire course of the reaction? 1.6 × 10−3 1.9 × 10−3 2.0 × 10−3 2.2 × 10−3

1.9 x 10⁻³ M/s.

Explanation:

The average rate of the reaction = - ΔC/Δt,

where, ΔC is the change in the concentration during the time interval Δt.

∴ Average rate = - ΔC/Δt = - (0.4 M - 1.8 M) / (720 s - 0 s) = 1.94 x 10⁻³ M/s ≅ 1.9 x 10⁻³ M/s.

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