Question

3.A solution contains 40g of common salt in 320 g of water .Calculate the concentration in terms of mass by mass percentage of the solution.

Answer 1

Answer:

mass of solute = 40g

mass of solvent= 320g

concentration= mass of solute/mass of solvent×100

= 40/320×100

= 100/8

= 12.5%

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Answer 2

Mass of solute (salt) =$40 \: g$

Mass of solvent (water) =$320 \: g$

We know,

Mass of solution =Mass of solute +

Mass of solvent

= $40 \: g + 320 \: g$

Mass percentage of solution

$\frac{ Mass \: of \: solute }{ Mass \: of \: solution} \times 100 \\ = \frac{40}{360} \times = 11.1\%$