Question

What is the mass of a liquid having density 20 kg/m^3, enclosed in a sphere of radius 1 m?

(a) 80.7 kg

(b) 83.7 kg

(c) 85.7 kg

(d) 88.7 kg

I got this question in an online interview.

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

Answer 1

Right answer is (b) 83.7 kg

To explain I would say: Volume of liquid = (4/3)π1^3 = 4.18 m^3, => mass of liquid = 20*4.18 = 83.7 kg.