Question

if 7.5 ml of ethyl alcohol is dissolved in a water solution such that the total volume of solution is 450 ml , calculate the concentration of ethyl alcohol as volume percent .

Answer 1

Answer:— 1.6%

Explanation :-

VOLUME BY VOLUME PERCENTAGE OF A SOLUTION:-

(VOLUME OF SOLUTE/VOLUME OF SOLUTION ) × 100

SO HERE....

CONCENTRATION OF ETHYL ALCOHOL= 7.5/450 ×100

( 75/450*10)×100

≈1.6 %

.

Answer 2

The concentration of ethyl alcohol in volume percentage is 1.66%

Given,

Volume of ethyl alcohol=7.5 ml

Volume of solution=450 ml.

To find,

volume by volume percentage of ethyl alcohol in the solution.

Solution:

Volume by volume of a solute in a solution is defined as the volume of solute in 100 ml of that solution.

for example:4% aqueous HCl solution

This indicates that 4 ml of HCl is present in 100 ml of solution.

So,

(Volume of solute/Volume of solution)x 100=volume percentage

Volume percentage=$\frac{7.5}{450} X100$

                                  =$\frac{75}{45}$

                                  =$1.66 %$ %.

The concentration of ethyl alcohol is 1.66%.

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