Consider that you prepared a solution by mixing 0.17 g solute with 8.26 g of solvent. If you measured that the solution had a molality of 0.157 m, what is the molar mass of the solute? Express your answer numerically to three significant figures.
mass of solute = 0.17 g
mass of solvent = 8.26 g = 0.00826 kg
molality = 0.157m
molality = number of moles of solute/mass of solvent in Kg
number of moles of solute = molality x mass of solvent in Kg
number of moles of solute = 0.157m x 0.00826 Kg
number of moles of solute = 0.001297 moles
number of moles = mass/mola mass
molar mass = mass/number of moles
molar mass = 0.17/0.001297 = 131.07 grams
molar mass of solute = 131.07 grams/mole.
molar mass of solute = 1.31x10^2 gram/mole
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