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| Calculations: Formula: NaCl2.2H2O Molar Mass: 129.9254 g/mol 1g=7.69672442801792E-03 mol Percent composition (by mass): Element Count Atom Mass %(by mass) Na 1 22.9898 17.69% Cl 2 35.453 54.57% H 4 1.0079 3.1% O 2 15.999 24.63% | 
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