JEE Main202228 Jun 2022Evening ShiftChemistryBiomoleculesActual
2 . 5   g of protein containing only glycine C 2 H 5 NO 2 is dissolved in water to make 500   mL of solution. The osmotic pressure of this solution at 300   K is found to be 5 . 03 × 10 - 3 bar. The total number of glycine units present in the protein is (Given : R   =   0 . 083   L   bar   K - 1   mol - 1   )
Correct answer
330
Step-by-step solution
π = CRT 5 . 03 × 10 - 3 = 2 . 5 × 1000 M . wt × 500 × 0 . 083 × 300 M.wt. = 24 . 752   × 10 3 gram = 24752 gram Molar mass of glycine NH 2 CH 2 COOH = 75   g / Mol . No of glycine unit in protein = 24752 75   =   330 . 02   ≃   330   units