Question

4. If the boiling point of nitrogen is -196°C, what can be deduced about: 4.1 the amount of energy required to change the state from liquid to gas? 4.2 the forces between the particles?

Answer 1

Answer:

Nitrogen is not a liquid at room temperature under any conditions. When stored in a Dewar under 1 atm pressure, it is at its normal boiling point, -196 oC, and slowly boiling away at that temperature. The Dewar is an insulated container. A 4.0 L Dewar with liquid nitrogen will last roughly a week before it is all boiled away.

Liquid nitrogen can be as high as -147 oC which is its critical temperature, the highest temperature under which the liquid can exist. At this temperature, the external pressure is about 33 atm, called the critical pressure