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		Calculate molar mass | 
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| Calculations: Formula: 8Na2S2O3.5H2O Molar Mass: 256.1706 g/mol 1g=3.9036485841857E-03 mol Percent composition (by mass): Element Count Atom Mass %(by mass) Na 2.3 22.9898 21.07% S 2.2 32.06 28.15% O 8.5 15.999 53.09% H 17.9 1.0079 7.06%  | 
		
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