i) Determine how many moles of He are in 17 g of He?
ii) A flight attendant wants to vary the temperature of the air in the cabin from 18.0° C to 21.2° C devoid of changing the number of moles of air per m3. What fractional change in pressure would be needed?
iii) A cylinder in a car engine takes Vi = 4.50 10-2 m3 of air to the chamber at 30° C and at atmospheric pressure. The piston then compresses the air to 0.123 times of the original volume (0.123 Vi) and to 24.9 times the original pressure (24.9 Pi). Determine the latest temperature of the air?