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Ways to Define Concentration

40% by weight...

Question

$40 %$ by weight solution will contain how much mass of the solute in $1$ L solution? Density of the solution is $1.2$ g $/$ mL.

480

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48

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38

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380

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Solution

The correct option is B $480$ g
Molarity $= \frac{s o l u t i o n \times 10 (i n l i t r e)}{m o l e c u l a r w e i g h t o f t h e s o l u t e}$

Molarity $= \frac{40 \times 1.2 \times 10}{M \times 1000}$
Again, since

Molarity $= \frac{w e i g h t o f t h e s o l u t e / M}{v o l u m e o f t h e s o l u t i o n (i n l i t r e)}$

Therefore, the weight of solute $= 480$ g.

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