Answer:
(a) The density of the Martian atmosphere is 0.021kg/m^3
(b) The density of the Martian atmosphere (0.021kg/m^3) is less than the density of the Earth's atmosphere (1.217kg/m^3)
Explanation:
(a) Density of Martian atmosphere (D) = P/RT
P = 900 Pa, R = 189 J/kgK, T = -50°C = -50+273 = 223K
D = 900/189×223 = 900/42,147 = 0.021kg/m^3
b) Density of Earth's atmosphere (D) = P/RT
P = 101.6kPa = 101.6×1000 = 101,600 Pa, R = 287 J/kgK, T = 18°C = 18+273 = 291K
D = 101,600/287×291 = 101,600/83,517 = 1.217kg/m^3
The density of Martian atmosphere is less than the density of the Earth's atmosphere