Question

The relationship between osmotic pressure at 273k when 10g glucose (p1),10g(p2) urea and 10g sucrose (p3) are dissolved in 250 ml of water is

Answer 1

Answer:

We know that the osmostic pressure is given by Π=iMRT

where i is the Van't Hoff factor

          M is the molarity

          R=0.08206 L-atm mol  

−1

 K  

−1

 is the gas constant

          T is the absolute temperature

Π∝M

Molarity is inversely proportional to molecular weight.

Molecular weight of glucose=180, urea=60, sucrose=342.

Osmotic pressure is also inversely proportional to molecular weight.

P  

1

​  

=Osmotic pressure of glucose (10 g)

P  

2

​  

=Osmotic pressure of urea (10 g)

P  

3

​  

=Osmotic pressure of sucrose (10 g)

So, P  

2

​  

>P  

1

​  

>P  

3