Question

A 5% solution of cane-sugar (molecular weight=342) is isotonic with 1% solution of substance molecular weight of ​

Answer 1

Answer:

68.4 g

Explanation:

Given:

5% cane sugar = 5 g cane sugar

molar mass of cane sugar (C12H22O11) = 343g

1% unknown solutions = 1 g substance

Solution:

Isotonic solution are the solutions who's osmotic pressure are same.

Osmotic pressure = π

π1(5% cane sugar) = π2(1% unknown substance)

osmotic pressure π = CRT

π = (n/V)RT

π1 = π2

(n/V)RT = (n/V)RT

n1 = n2

mass/Molar mass= mass/Molar mass

5/342 = 1/molar mass

molar mass = (1 X 342)/5

= 68.4g