If a 45.3-g sample of potassium nitrate is dissolved in enough water to make 225 mL of solution, what will be the molarity?

Answer 1

moles KNO3 = 45.3 g /101.1 g/mol=0.448
M = 0.448/ 0.225 L=1.99

Answer 2

Where did the 101.1 came from

Answer 3

the 101.1 is the molar mass of the KNO3, this was used to convert the grams into mols