Answer to Question #56494 in Physics for Gin love blue

Question

1/ An oxygen cylinder of volume 30 liters has an initial gauge pressure of 15 atm and a temperature of 27 °C. After some oxygen is withdrawn from the cylinder, the gauge pressure drops to
11 atm and its temperature drops to 17 °C. Estimate the mass of oxygen taken out of the cylinder.
2/ A balloon whose volume is 750 m3 is to be filled with hydrogen at atmospheric pressure
(1.01105 Pa).
(a) If the hydrogen is stored in cylinders with volumes of 1.90 m3 at a gauge pressure of 1.20  106 Pa, how many cylinders are required? Assume that the temperature of the hydrogen remains constant.
(b) What is the total weight (in addition to the weight of the gas) that can be supported by the
balloon if the gas in the balloon and the surrounding air are both at 15.0°C? The density of air at
15.0oC and atmospheric pressure is 1.23 kg/m3.
(c) What weight could be supported if the balloon were filled with helium (molar mass 4.00 g/mol) instead of hydrogen at 15.0°C? What are your observations?