Question

What is the molarity of the mixture of two solution, first solution 4 M and 10 liter and second solution 2 M and 40 liter?

(a) 1.2 M

(b) 2.4 M

(c) 4.8 M

(d) 9.2 M

This question was addressed to me in an interview for job.

Question is from Concentration in section Moles, Density & Concentration of Basic Chemical Engineering

Answer 1

Correct choice is (b) 2.4 M

For explanation I would say: Molarity of mixture = (M1V1 + M2V2)/(V1 + V2) = (4*10 + 2*40)/ (10 + 40) = 2.4 M.