Chemistry buildings built to code require a great deal of ventilation, which necessitates a delicate air-handling system to balance the air lowing into the building and the air lowing out. For example, if the air low out of the building is too high, the pressure inside the building could drop to 0.990 bar while the pressure outside was 1.000 bar. Calculate the force that would then be necessary to open a door to the outside measuring 78 inches high and 30 inches wide. Neglect the mass of the door itself. (1 inch = 2.54 cm.) 1.6 Estimate the number of moles of butanol on the surface of a circular drop of water with a diameter of 1.0 cm if surface tension experiments show that the efective area per butanol molecule is 33A 2 .