0.60 moles of potassium nitrate is dissolved in 300 mililiters of solution

= 2 M or 2 mol/Liter

Explanation:

Molarity or concentration is calculated by the formula;

Molarity = Number of moles / Volume in liters

In this case;

Moles = 0.6 moles

Volume in L = 0.3 L

Therefore;

Molarity = 0.6 mol/0.3 L

= 2 M or 2 moles/Liter