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Answer to Question #55691 in General Chemistry for odonghanro daniel

Question #55691
A solution contains 4 grams of sodium hydroxide in 250ml of solution. If Na=23, O=16 , H=1 and
1cm3
of water weighs1g, what is the concentration of the solution in weight per weight percent?
2.81%
1.92%
1.57%
3.29%
Expert's answer
m(NaOH) = 4 g;
1 cm3 of H2O weights 1 g; V = 250 ml; m(H2O) = 250 g;
m(the solution) = m(NaOH) + m(H2O);
m = 254 g;
w = m(the solute)/m(the solution) * 100%
w (NaOH) = 4/254*100% = 1.57%

Answer: 1.57%

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