Question

What is the molarity of a potassium nitrate solution when 0.29 moles of KNO3 are dissolved to make 750mL of solution?

Answer 1

Answer:

$0.39\text{ M}$

Explanation:

Here, we want to get the molarity of the potassium nitrate solution

Mathematically:

$molarity\text{ = }\frac{number\text{ of moles}}{volume}$

We have to convert the volume to liters by dividing by 1000:

$\frac{750}{1000}\text{ = 0.75 L}$

We have the molarity as:

$molarity\text{ = }\frac{0.29}{0.75}\text{ = 0.39 M}$