Question

A solution contains 25% salt by weight in water. The solution has a density of 12 g/cm Express the composition as: (a) Kilograms salt per kilogram of H,O (b) Pounds of salt per cubic foot of solution​

Answer 1

Consider the volume of the solution =xcm3

Then the mass of the solution will be =1.13x

(mass=density×volume)

The solution contains 18% of NaCl by weight

∴10018×1.13x=36

x=18×1.133600=177cm3

I hope it will help you.

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Answer 2

Answer:

5.70 mol. kg-¹

Explanation:

Now

25

%

of this mass represents the mass of salt....and thus..

Molarity

=

Moles of solute (mol)

Volume of solution (L)

=

1.135

⋅

g

×

25

%

58.44

⋅

g

⋅

m

o

l

−

1

1

⋅

m

L

×

10

−

3

⋅

L

⋅

m

L

−

1

=

19.4

⋅

m

o

l

⋅

L

−

1

Molality

=

Moles of solute (mol)

Mass of solvent (kg)

=

1.135

⋅

g

×

25

%

58.44

⋅

g

⋅

m

o

l

−

1

1.135

⋅

g

×

75

%

×

10

−

3

⋅

k

g

⋅

g

−

1

=

5.70

⋅

m

o

l

⋅

k

g

−

1