Question

2. The gas laws are defined for ideal gases. Real gases do not always follow the gas laws exactly Under what conditions would you predict that real gases least approximate ideal gas behavior Explain why real gases behave least like ideal at the conditions you stated. 3. Define molar mass including the units in which it is expressed. on produced a 0.311 g sample of gas which occupied 225 ml at 55°C exerting a pressure of 886 mm Hg. What is the molar mass of the gas? Show all your calculations. 5. A sample of H2 is collected by displacing 145 mL of water. The pressure of the gas and the atmosphere are equalized. The atmospheric pressure is 745 mm Hg. The temperature of the water and that of the gas are identical at 26°C. The vapor pressure of water at 26°C is 25.209 mm Hg How many moles of gas were collected? Show your calculations.

Answer 1

Ans 2 :

The real gases least approximate the ideal gas behavior at high pressures and low temperatures.

This is because for the real gases to behave as ideal gases, they must have negligible inter molecular forces of attractions and the molecules must occupy a negligible part of the total volume of gas.

But at high pressures and low temperatures , these attractive forces become predominant and the molecules occupy an appreciable amount of total volume of gas.