In a reaction A → B, if the concentration of A decreases from 0.8 M to 0.4 M in

In a reaction A → B, if the concentration of A decreases from 0.8 M to 0.4 M in 20 minutes, what is the average rate of reaction? (2019)

In a reaction A → B, if the concentration of A decreases from 0.8 M to 0.4 M in 20 minutes, what is the average rate of reaction? (2019)

Step 1: Identify the initial concentration of A, which is 0.8 M.
Step 2: Identify the final concentration of A, which is 0.4 M.
Step 3: Calculate the change in concentration of A (Δ[A]) by subtracting the final concentration from the initial concentration: Δ[A] = 0.8 M - 0.4 M.
Step 4: Perform the subtraction: Δ[A] = 0.4 M.
Step 5: Identify the time period (Δt) over which the change occurs, which is 20 minutes.
Step 6: Calculate the average rate of reaction using the formula: Average rate = Δ[A] / Δt.
Step 7: Substitute the values into the formula: Average rate = 0.4 M / 20 min.
Step 8: Perform the division: Average rate = 0.02 M/min.

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