Problem: How many grams of Na 2SO4 (142.05 g/mol) should be added to 175 mL of water to prepare a 0.555 m solution of Na 2SO4? Assume the density of water is 1.00 g/mL.a. 201 gb. 55.2 gc. 13.8 gd. 91.2 ge. 54.2 g

FREE Expert Solution

We're being asked to determine the mass of Na2SO4 needed to be added to 175 mL of water in order to make a 0.55 m solution

Recall that molality can be calculated as:

molality=moles solutekg solvent 

We can calculate for the mass of a Na2SO4 using a dimensional analysis with proper conversion and using the molar mass and density provided.

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Problem Details

How many grams of Na 2SO4 (142.05 g/mol) should be added to 175 mL of water to prepare a 0.555 m solution of Na 2SO4? Assume the density of water is 1.00 g/mL.

a. 201 g

b. 55.2 g

c. 13.8 g

d. 91.2 g

e. 54.2 g

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