In a reaction A → B, if the concentration of A decreases from 0.5 M to 0.1 M in 20 minutes, what is the average rate of reaction?

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Q: In a reaction A → B, if the concentration of A decreases from 0.5 M to 0.1 M in 20 minutes, what is the average rate of reaction?

Solution: Average rate = (change in concentration) / (time) = (0.5 - 0.1) / 20 = 0.02 M/min.

Steps: 8

Step 1: Identify the initial concentration of A, which is 0.5 M.
Step 2: Identify the final concentration of A, which is 0.1 M.
Step 3: Calculate the change in concentration of A by subtracting the final concentration from the initial concentration: 0.5 M - 0.1 M.
Step 4: Perform the subtraction: 0.5 - 0.1 = 0.4 M.
Step 5: Identify the time over which the change occurs, which is 20 minutes.
Step 6: Calculate the average rate of reaction using the formula: Average rate = (change in concentration) / (time).
Step 7: Substitute the values into the formula: Average rate = 0.4 M / 20 min.
Step 8: Perform the division: 0.4 M / 20 = 0.02 M/min.