For the first order dissociation reaction 
 $A_2{B}_3\left(aq.\right)\to 2A^{3+}\left(aq.\right)+3B^{2-}\left(aq.\right)$
a definite volume of solution is taken at different instants and its osmotic pressure rise is measured. If osmotic pressure at [t = 0] is 2 mm of Hg and at [t = 10] min is 6 mm of Hg then answer the questions given below for the solution:  [Given density of solution remains constant and is equal to 1gm/ml]