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3 years ago

What is the molarity of a sodium chloride solution made by dissolving 4.512 moles to make 2.0 L?

Chemistry

1 answer:

Svet_ta [14]3 years ago

6 0

Answer:

2.40 M

Explanation:

The molarity of a solution tells you how many moles of solute you get per liter of solution.

Notice that the problem provides you with the volume of the solution expressed in milliliters,

. Right from the start, you should remember that you must convert this volume to liters by using the conversion factor

1 L

Now, in order to get the number of moles of solute, you must use its molar mass. Now, molar masses are listed in grams per mol,

g mol

−

, which means that you're going to have to convert the mass of the sample from milligrams to grams

1 g

Sodium chloride,

NaCl

, has a molar mass of

58.44 g mol

−

, which means that your sample will contain

unit conversion



280.0

⋅

molar mass



1 mole NaCl

58.44

0.004791 moles NaCl

This means that the molarity of the solution will be

solute

solution

0.004791 moles

2.00

⋅

−

2.40 M

The answer is rounded to three sig figs, the number of sig figs you have for the volume of the solution.

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