The temperature and pressure at the surface of Mars during a Martian spring day were determined to be -56 oC and 433 Pa, respectively. (a) Determine the density of the Martian atmosphere for these conditions if the gas constant for the Martian atmosphere is assumed to be equivalent to that of carbon dioxide. (b) Compare the answer from part (a) with the density of the earth's atmosphere during a spring day when the temperature is 18 oC and the pressure 101.6 kPa (abs).