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A solution is prepared by mixing 30 g of baking soda
in 70 g of water. What are the concentrations of the solute and
solvent in % by mass?
A. Solute: 20%, Solvent 80%
B. Solute: 30%, Solvent 70%
C. Solute: 60%, Solvent 40%
D. Solute: 25%, Solvent 75%​