Question

You need to prepare 250. ml of a 0.600 m aqueous solution of sucrose, c12h22o11(aq, which is used frequently in biological experiments.

Answer 1

Molality is a unit of measurement for concentration that is calculated through the equation,
                               m  = moles of solute / kg of solvent
Recall that because water's density is approximately equal to 1 g/mL, 250 mL of water is also equal to 250 g or 0.25 kg. Substituting the known values,
                            0.6 = moles of solute / 0.25 kg solvent
                        moles of solute = 0.15 moles
Then, we determine the mass of sucrose by multiplying the calculated number of moles with the molar mass of sucrose (342 g/mol). The answer would be equal to 51.3 g.