In: Chemistry
Oxygen therapy uses various devices to provide oxygen
to patients having difficulty getting sufficient amounts from air
through normal breathing.
Among the devices are nasal cannula, which transport oxygen through
small plastic tubes from a supply tank to prongs placed in the
nostrils.
Consider a specific configuration in which the supply tank (volume
= 3.00 ft3) was filled to a pressure of 2100.0 psig at a
temperature of -30.0°F.
The patient is in an environment where the ambient temperature is
40.0°F.
When the tank is used, the pressure begins to decrease as oxygen
flows at 5.00 L/min through a tube to the cannula where it is
discharged into the nostrils.
Estimate the original mass of oxygen in the tank using the compressibility-factor equation of state. (kg O2)
What is the initial pressure when the temperature is 40.0°F? (atm absolute)
How long will it take for the gauge on the tank to read 50.0 psig at an atmospheric pressure of 1 atm and the stated discharge? (.... x 10^3 min)