You have 5.5 grams of a substance with a molar mass of 26.98 g/mol.  You dissolve this substance in 25 mL of water.  What is the molarity? Hint: First, convert grams to moles. 26.98 grams = 1mole.

Introductory Chemistry: An Active Learning Approach
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Chapter3: Measurement And Chemical Calculations
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Problem 61E
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You have 5.5 grams of a substance with a molar mass of 26.98 g/mol. 

You dissolve this substance in 25 mL of water. 

What is the molarity?

Hint: First, convert grams to moles. 26.98 grams = 1mole.

Then, convert milliliters to liters. 1 L = 1000 mL

 

Finally, plug those numbers in, doing moles divided by liters.

0.20 M
0.0082 M
196 M
8.2 M
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