Chapter 1 - Measurement and Problem Solving - Learning Path Questions and Exercises - Exercises - Page 30: 55

100 Kg

Density of silica aerogel $=0.1 g/cm^{3}$ 5% of the mass is occupied by silica, the rest 95% is empty. Mass of silica in $1 m^{3}$ is given by $Mass = Density \times Volume = 0.1 g/cm^{3}\times 10^{6} cm^{3} =10^{5} g = 100 kg$