A 5 molar solution is 27.75% CaCl2 by mass, what is the density

a-5-molar-solution-is-27-75-cacl2-by-mass-what-is-the-density

A 5 molar solution is 27.75% CaCl2 by mass, what is the density of the solution?

A. 1 g/cm^3

B. 2 g/cm^3

C. 3 g/cm^3

D. 4 g/cm^3

I have been asked this question in an international level competition.

I’d like to ask this question from Concentration topic in chapter Moles, Density & Concentration of Basic Chemical Engineering

Correct option is B. 2 g/cm^3

The explanation is: Let the mass of Solution be 100 grams, => moles of CaCl2 = 27.75/111 = 0.25, Density of solution = 5*(100/0.25) = 2000 kg/m^3 = 2 g/cm^3.