The total pressure on the surface of Mars is variable day-to-day as it is on Earth. On a given day, it is 0.0068 atmospheres. The mole fractions of the top three components in the Martian atmosphere are constant and are 0.953 for CO2, 0.026 for N2, and 0.019 for Ar. In terms of torr the partial pressure of Ar on Mars is how many torr