18 ~g of glucose is dissolved in 90 ~g of water. The relative lowering of vapour pressure of the solution is equal to

Step-by-step solution

From Rault’s law for non-volatile solute, we know that p^ -p_s p^ = n₂ n₁+n₂ For dilute solution, relative lowering of vapour pressure, aligned & n₂= 18 180 =0.1 & n₁= 90 18 =5 & p^ -p_s p^ = 0.1 5 =0.02 aligned