What mass of acetic acid (CH₃COOH, molar mass = 60.05 g/mol) must be dissolved in 250 g water to produce a 0.150-m solution ?
Strategy

This problem is similar to conversions performed in Chapter 4, except that the desired molality is used as a conversion factor. The following diagram outlines the problem-solving strategy.

The desired molality is used as a conversion factor to find the number of moles of solute in 250 g (= 0.250 kg) of the solvent.

Transcribed Image Text:

Mass of solvent (HO) Molality of CHCOOH Moles of CHCOOH Molar mass of CHCOOH Mass of CHCOOH