A student determined the latent heat of vaporisation of a liquid using an electrical heater to boil the liquid in a Pyrex beaker.
The apparatus used is shown below.
Complete the circuit diagram to show a suitable circuit.
The student used her graph to determine a value for the latent heat of the liquid in the beaker. She concluded that the liquid was pure water.
Liquid | Latent heat of vaporisation / MJ kg−1 |
Pure water | 2.26 |
Weak salt water solution | 2.10 |
Strong salt water solution | 2.00 |
Comment on the validity of the student’s conclusion.
V = 20.5 V
I = 10.5 A
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