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Answered 2012-12-07 23:37:50

First.

Get moles sodium sulfate.

5.35 grams Na2SO4 (1 mole Na2SO4/142.05 grams)

= 0.0377 moles Na2SO4

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Second.

Molarity = moles of solute/Liters of solution ( 330 mL = 0.33 Liters )

Molarity = 0.0377 moles Na2SO4/0.33 Liters

= 0.114 M Na2SO4

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