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Based on the Type of Solvent

20 g solute i...

Question

20 g solute is present in 200 mL solvent. the density of solvent is 0.9 g/mL. what is the weight fraction and weight percent of the solute?

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Solution

$W e i g h t f r a c t i o n = \frac{W e i g h t o f t h e s o l u t e}{W e i g h t o f t h e s o l u t i o n} W e i g h t o f t h e s o l u t e = 20 g W e i g h t o f t h e s o l v e n t = V o l u m e \times d e n s i t y = 200 \times 0.9 = 180 g W e i g h t o f t h e s o l u t i o n = W e i g h t o f t h e s o l u t e + W e i g h t o f t h e s o l v e n t = 20 + 180 = 200 g W e i g h t f r a c t i o n = \frac{W e i g h t o f t h e s o l u t e}{W e i g h t o f t h e s o l u t i o n} = \frac{20}{200} = \frac{1}{10} W e i g h t % = \frac{W e i g h t o f t h e s o l u t e}{W e i g h t o f t h e s o l u t i o n} \times 100 = \frac{20}{200} \times 100 = 10 %$

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