An organic compound is known to contain 50.8 % of iodine by mass. When a sample of this compound is subjected to the Carius method for the estimation of halogens, it yields 0.47 g of silver iodide ( AgI ) precipitate. The mass of the original organic compound sample taken for the analysis is mg . (Given: Atomic masses of Ag = 108 u and I = 127 u )

Step-by-step solution

Molar mass of AgI = 108 + 127 = 235 g mol ⁻¹ Moles of AgI formed = 0.47 235 = 0.002 mol Moles of iodine in the sample = Moles of AgI = 0.002 mol Mass of iodine = 0.002 127 = 0.254 g Let the mass of the organic compound be W g . Percentage of iodine = ( Mass of iodine W ) 100 50.8 = 0.254 W 100 W = 25.4 50.8 = 0.5 g Mass in mg = 0.5 1000 = 500 mg Answer: 500