Answer:
146.6 g
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
