calculate the mass of a solute

Question

calculate the mass of solute ( in grams) of a 0.107m solution that contains 426.93 ml of water. the solute has a molar mass of 119.73 g/ mole.

Answer 1

0.107 m means 0.107 moles of solute in 1 kg of solvent. Since we have 426.93 ml of water as the solvent, and if we assume a density of 1.0 g/ml, we have 426.93 g of water (solvent) = 042693 kg solvent

Thus, moles of solute present = 0.107 mol/kg x 0.42693 kg = 0.04568 moles solute

mass solute = 0.04568 moles x 119.73 g/mol = 5.4694 g = 5.47 g solute (3 sig. figs.)