Question

Which of the following solution has concentration more than 10% 

(1) 10 g of ethyl alcohol mixed with 100 g of water

(2) 5 g of ethyl alcohol mixed with 40 g of water

(3) 1 g of ethyl alcohol mixed with 25 g of water

(4) 10 g of ethyl alcohol mixed with 95 g of water​

Answer 1

Answer:

3 is correct answer

Explanation:

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Answer 2

Solution with more than 10% concentration is (2) 5 g of ethyl alcohol mixed with 40 g of water.

Given - Mass of solute and solvent

Find - Concentration more than 10%

Solution - Concentration is calculated as - Mass of solute/mass of solution*100

(1) Mass of solute = 10 gram

Mass of solution = mass of solute + mass of solvent

Mass of solution = 10 + 100

Mass of solution = 110 gram

Concentration =

$\frac{10}{110} \times 100$

Concentration = 9%

(2) Mass of solute = 5 gram

Mass of solution = mass of solute + mass of solvent

Mass of solution = 5 + 40

Mass of solution = 45 gram

Concentration =

$\frac{5}{45} \times 100$

Concentration = 11.1%

(3) Mass of solute = 1 gram

Mass of solution = mass of solute + mass of solvent

Mass of solution = 1 + 25

Mass of solution = 26 gram

Concentration =

$\frac{1}{26} \times 100$

Concentration = 3.8%

(4) Mass of solute = 10 gram

Mass of solution = mass of solute + mass of solvent

Mass of solution = 10 + 95

Mass of solution = 105 gram

Concentration =

$\frac{10}{105} \times 100$

Concentration = 9.5%

Hence, the solution with more than 10% concentration is of ethyl alcohol and water.

So, correct answer is (2) 5 g of ethyl alcohol mixed with 40 g of water.

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