Respuesta :

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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

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