Determining the Molecular Formula

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Concentration of Solutionsmolarity=moles of soluteliters of solutionM=nLMolarity of solution prepared by mixing23.4g of Na 2 SO 4 with enough water to makea solution whose volume is 125ml?<strong>Formula</strong> weight of Na2SO 4is 142.0 g/mol23. 4 / 142.0M = = 132 .0.125
Dilution ProblemGiven a solution with a known molarity oneis to dilute it to form a solution of a lessermolarity.Given a 1.00M solution of CuSO 4 , make250ml of a 0.1M solution.How many moles of CuSO 4 do we need?n = ( 0250 . )x( 01 . ) = 0025 . molWhat volume of <strong>the</strong> 1.0M solution containsthis amount ?0025 . molV = = 0.025L100 . mol / LAdd 25ml of 1.00M solution to 225ml of water
Page 1 and 2: Determining the Molecular Formula1.
Page 3 and 4: Molecular formula from combustionGi
Page 5 and 6: moles O =0.061g16.00g/mol =0.0038 m
Page 7: Given the reaction2Na PO ( aq ) + 3

Determining the Molecular Formula

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