Question

When 800 gm of a 40% solution by weight was cooled, 100
gm of solute precipitated. The percentage composition of
remaining solution is
(a) 31.43% (b) 5.56% (c) 6.78% (d) 6.96%

Answer 1

The percentage composition of  remaining solution is 31.43 %

Option (A) is correct.

Explanation:

Solute present in 800 g solution = 800 × 40 / 100  = 320 g

Solute precipitated = 100 g

Solute left = 220 g

• Total weight of solution = 800 - 100 = 700 g
• 70 g solution has solute = 220
• 100 g solution has solute = 220 / 700 x 100 = 31.43 %

Thus the percentage composition of  remaining solution is 31.43 %

Also learn more

A compound has the following percentage composition.

Al=0.2675 g, P = 0.3505 g, O = 0.682 g.

If the molecular weight of the compound is 122 and its original weight which on analysis gave the above results 1.30 g. Calculate the molecular formula of the compound.

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