A solution with a concentration of 0.0640 g/L CsOH contains 1.260 g CsOH. What is the volume of the solution?

Use concentration = mass ÷ volume, so volume = mass ÷ concentration. Divide 1.260 g by 0.0640 g/L: 1.260 ÷ 0.0640 = 19.6875 L, which rounds to 19.7 L. The correct choice is 19.7 L.

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