One type of gas mixture used in anesthesiology is a 50% / 50% mixture (by volume) of nitrous oxide (n2o) and oxygen (o2), which can be premixed and kept in a cylinder for later use. because these two gases don't react chemically at or below 2000 psi, at typical room temperatures they form a homogeneous single gas phase, which can be considered an ideal gas. if the temperature drops below -6°c, however, n2o may begin to condense out of the gas phase. then any gas removed from the cylinder will initially be nearly pure o2; as the cylinder empties, the proportion of o2 will decrease until the gas coming from the cylinder is nearly pure n2o. in a test of the effects of low temperatures on the gas mixture, a cylinder filled at 25.0°c to 2000 psi (gauge pressure) is cooled slowly and the pressure is monitored.
1. what is the expected pressure at -5.00∘c if the gas remains a homogeneous mixture?