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Answered 2012-05-23 18:39:52

Get moles sodium sulfate first.

15.5 grams Na2SO4 (1 mole Na2SO4/142.05 grams) = 0.1091 moles Na2SO4

Now,

Molarity = moles of solute/ Liters of solution ( 35 ml = 0.035 Liters )

Molarity = 0.1091 moles Na2SO4/0.035 Liters

= 3.1 M Na2SO4 solution

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