![]() If Pb 2+ had been used to precipitate the chloride, the calculuation would need to be modified to account for the fact that each mole off PbCl 2 contains two moles of chloride.The number 0.0984 therefore actually is "good" to four significant figures and the answer can be expressed to four significant figures. Notice that even though the mass of sample (0.0984) only contains three significant figures, the number is known to one part in a thousand (0.0001/0.0984 = 1/1000).One mole of AgCl contains one mole of Cl. The following calculations would be done for the gravimetric determination of chloride: Mass of sample of unknown chloride after drying: 0.0984 g ![]()
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