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Get moles by;

Molarity = moles of solute/Liters of solution

0.50 M KNO3 = moles KNO3/2.0 L

= 1.0 mole KNO3

Now find grams of 1.0 mole KNO3

1.0 mole KNO3 (101.11 grams/1 mole KNO3)

= 101.11 grams KNO3 needed

call it 100 grams

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Q: How may grams of KNO3 should be used to prepare a 2.0L of a 0.50 M solution?
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