Question

What is the percentage by volume of a soution formed by mixing 25ml of isopropanol with 45

Answer 1

When concentrated acid is added to water it is an exothermic process as heat is released. When concentrated acid is added to water whether the process is exothermic and not endothermic. It is an exothermic reaction as heat is released during the process.

Answer 2

The percentage by volume of isopropanol is 35.7%.

We have to find the percentage by volume of a solution formed by mixing 25 ml of isopropanol with 45ml.

Percentage by volume is the percentage ratio of volume of solute to the volume of solution.

$\text{percentage by volume}=\frac{\text{volume of solute}}{\text{volume of solution}}\times 100$

Given,

• Volume of solute = volume of isopropanol = 25ml
• volume of solution = volume of solute + volume of solvent = 25 ml + 45 ml = 70 ml

Percentage by volume of isopropanol = volume of isopropanol/volume of solution × 100

$=\frac{25}{70}\times100\\\\=\frac{2500}{70}\\\\=35.7\%$

Therefore the percentage by volume of isopropanol is 35.7%.

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