In the analysis of 0.7011 g of an impure chloride-containing sample, 0.9805 g of AgCl (molar mass = 143.32) were precipitated. What is the percentage by mass of chloride in the sample?
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Step 1 First Calculate the moles of AgCl moles of AgCl = ( mass / molar mass of AgCl ) moles of AgCl = ( 0.9805g / 143.32gmol-1 ) moles of AgCl = 0.0068 mol Step 2 Calculate the moles of Cl ion in the samplesmoles of Cl- ion = moles of AgCl moles of Cl- ion = 0.0068 mol Step 3 Calculate the mass of Cl Mass of Cl = ( moles ) • ( molar atomic mass of Cl ) mass of Cl = 0.0068mol • 35.5gmol-1 mass of Cl = 0.243g Step 4 Calculate the percentage by mass of Cl ion Percentage by mass = ( mass of Cl / mass of impure sample ) • 100Percentage by mass = ( 0.243g / 0.7011g ) • 100 percentage by mass = 34.64 % ( Answer )  ...