a solution is prepared by mixing 20g of sodium chloride in 80g of water . what are the concentrations of the solute and solvent in % by mass ?
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You have 20g of NaCl which is dissolved in 80g pf H2O. So, the total weight is 100g, and 20/100 = 20% is the solute NaCl and 80/100 = 80% is the solvent, water.
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