Saturday, 6 September 2014

Ideal gases problems


                                 Ideal gases problems

(Ideal gas constant (R) = 8.3 mol-1K-1)

1. Sketch the variation of:
(a) pressure with volume
(b) volume with temperature 
(c) pressure with temperature 
for an ideal gas. 

2. Define:
(a) The absolute zero of temperature 
(b) the Kelvin
(c) The triple point of water


3. Calculate the number of moles of a gas of pressure 105 Pa at a temperature of 27oC occupying a volume of 5 m3.


4. An ideal gas at a temperature of 20oC occupies a volume of 2.5 m3 at a pressure of 2.5x105 Pa. It is then expanded isothermally to 6 m3. What is its new pressure? 

5. An ideal gas has a molar mass of 40 g and a density of 1.2 kgm-3 at 80oC. What is its pressure at that temperature? 

6. An ideal gas is contained in a metal cylinder with a volume of 0.25 m3 at a pressure of 15x105 Pa and a temperature of 20oC. If the gas is allowed to expand into the atmosphere at a pressure of 105 Pa and a temperature of 15oC what is its new volume?