Problem- An ultra-high-vacuum pump can reduce the pressure of air from 1.0 atm to 1.0E-12 mmHg. Calculate the number of air molecules in a liter at this pressure and 298k.Compare your results with the number of molecules in 1.0 L at 1.0 atm and 298k. Assume ideal-gas behavior.
Be supposed to answer all parts thus I can get five stars