What is the molarity of a solution that contains 75.0 grams of KNO3 dissolved in 0.350 L of solution?Group of answer choices4.14 M solution2.12 M solution8.18 M solution1.07 m solution

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03-11-2022
Chemistry

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What is the molarity of a solution that contains 75.0 grams of KNO3 dissolved in 0.350 L of solution?Group of answer choices4.14 M solution2.12 M solution8.18 M solution1.07 m solution

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AdamaI53253 AdamaI53253 · Answer 1 · 2022-11-03T09:16:38+01:00

Explanation:

The molarity (mol/L) is the ratio between the amount of substance in the solute (n1) and the volume of the solution in liters (V). The formula to find the molarity is: M = n1/V

First, let's transform 75.0 grams of KNO3 into moles using the following formula:

moles = mass/molar mass

molar mass of KNO3 is 101.1032 g/mol

moles = 75/101.1032

moles = 0.742 moles

So:

M = 0.742/0.350

M = 2.12 M

Answer: 2.12 M solution