A particular experiment requires 13.5 µL hydrochloric acid solution. If 250 mL of hydrochloric acid solution is available, how many times can the experiment be performed? (Note: 1mL = 1,000 µL.)

Convert the available solution to microliters: 250 mL × 1,000 µL/mL = 250,000 µL. Divide by 13.5 µL per experiment: 250,000 ÷ 13.5 ≈ 18,519, or about 18,500 experiments. So the correct choice is “about 18,500.”

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