Question

How many grams of KNO3 must be dissolved to
create 7.25L a 0.200M solution?

Answer 1

146.6 g

Step-by-step explanation:

First we calculate how many KNO₃ moles are there in 7.25 L of a 0.200 M solution, using the definition of molarity:

• Molarity = moles / liters

• Molarity * liters = moles

• 0.200 M * 7.25 L = 1.45 moles

Then we convert 1.45 moles of KNO₃ into grams, using its molar mass:

• 1.45 mol * 101.103 g/mol = 146.6 g