What is the tonicity of 05 mol urea solution relative to a r

What is the tonicity of .05 mol urea solution relative to a red blood cell?

a. hypertonic

b. hypotonic

c. isotonic

0.05 mol urea is is the molarity of urea. to compare the tonicity , first osmolarity of this solution has to be calculated

Molarity is used to calculate osmolarity

Osmolarity = Molarity X Nmber of components it will break into

So osmolarity of urea = 0.05 X 3 = 0.15

Osmolarity of RBCs = 285 to 310, which is very high from urea osmolarity

So the tonicity of this solution will be HYPOTONIC