Calculate the mass percent if 25.0 grams of sodium carbonate is dissolved in 245 grams of...
Homework Answers
Ans. A % (w/w) concertation is expressed as mass of solute per 100.0 g of solution.
# Mass of solution = Mass of water (solvent) + Mass of Na2CO3 (solute)
= 245.0 g + 25.0 g
= 270.0 g
Now,
% Na2CO3 (w/w) = (Mass of solute / Mass of solution) x 100
= (25.0 g / 270.0 g) x 100
= 9.259 %
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