Calculate the depression in freezing point of solution when 4 ~g nonvolatile solute of molar mass 126 ~g ~mol ⁻¹ dissolved in 80 ~mL water. [ . Cryoscopic constant of water .=1.86 ~K ~kg ~mol ⁻¹ ]

Step-by-step solution

aligned & 80 ~mL water =80 ~g water (Density of water = & 1 ~g / mL ) & T _ f = 1000 ~K _ f W ₂ M ₂ ~W ₁ & = 1000 ~g ~kg ⁻¹ 1.86 ~K ~kg ~mol ⁻¹ 4 ~g 126 ~g ~mol ⁻¹ 80 ~g & =0.74 ~K & aligned