Can anyone help me solve these two problems? 1. A tank of compressed air of volume 1.0 m^3 is pressurized to 40 atm at T= 273. A valve is opened and air is released until the pressure in the tank is 23.0 atm. How many air molecules were released? 2. About how long will it take a perfume molecule to diffuse a distance of 7.00 m in one direction in a room if the diffusion constant is 1.00 x 10^-5 m^2/s? Assume that the air is perfectly still- there are no air currents.