Chapter 12, Problem 81RPP

The bag and pump have a 6.76-kg mass. The volume of the inflated bag is 0.476 m³. The maximal bag pressure is 0.15 x 10⁵ N/m² above the air pressure at the site where it is used. In the 1997 climb, with the temperature at -20°C, the bag was filled in about 2 min with 10-20 pumps per minute. This raised the pressure in the bag to 0.58 x 10⁵ N/m² (equivalent to an elevation of 4400 m) instead of the actual outside pressure of 0.43 x 10⁵ N/m² at the 6450-m elevation at which the climber was treated. The treatment lasted for 2 h, with the climber inhaling about 15 times/min at about 0.5 L/inhalation, and was successful-the pulmonary edema disappeared.

What is closest to the number n of moles of air in the bag if its pressure is at the 6450-m level?

a. 3 moles

b. 10 moles

c. 13 moles

d. 110 moles

e. 170 moles