Two students design an experiment to find the specific latent heat of vaporisation of liquid nitrogen.
They set up their equipment as shown in the diagram:
The students also have access to a power supply, a voltmeter, an ammeter, and a stop-clock.
a.[6]
Explain how the students could use this equipment to determine an accurate value for the specific latent heat of vaporisation of liquid nitrogen.
b.[3]
In their experiment, the students find that a mass of 180 g of liquid nitrogen vaporises when 36.0 kJ of energy is supplied by the heater.
Calculate the specific latent heat of vaporisation of liquid nitrogen based on their results.