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

`0.39\text{ M}`

Step-by-step 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:

`(750)/(1000)\text{ = 0.75 L}`

We have the molarity as:

`molarity\text{ = }(0.29)/(0.75)\text{ = 0.39 M}`