Question

How much Sodium is there in a solution with 10 Kg of solvent (Density = 5 Kg/m^3) and concentration 4 molar?

(a) 23 grams

(b) 92 grams

(c) 184 grams

(d) 276 grams

The question was asked in an interview.

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

Answer 1

Right answer is (c) 184 grams

The explanation is: Volume of solvent = 10/5 = 2 m^3, => moles of sodium = 4*2 = 8 moles, => mass of sodium = 8*23 = 184 grams.