A dichloro organic compound is known to contain exactly two chlorine atoms per molecule. When 0.075 g of this compound is heated with fuming nitric acid and silver nitrate in a Carius tube, it produces 0.1435 g of silver chloride ( AgCl ) precipitate. The molar mass of the organic compound is g mol ⁻¹ . (Given: Atomic masses of Ag = 108 u and Cl = 35.5 u )

Step-by-step solution

Molar mass of AgCl = 108 + 35.5 = 143.5 g mol ⁻¹ Moles of AgCl formed = 0.1435 143.5 = 0.001 mol Moles of chlorine atoms in the sample = 0.001 mol Since each molecule of the organic compound contains 2 chlorine atoms, the moles of the organic compound will be half the moles of chlorine atoms. Moles of organic compound = 0.001 2 = 0.0005 mol Molar mass of the compound = Mass Moles = 0.075 0.0005 = 150 g mol ⁻¹ Answer: 150