A pure solid sample of Substance X is put into an evacuated flask. The flask is heated at a steady rate and the temperature recorded as time passes. Here is a
graph of the results:
150
130-
110
temperature (°C) 90
70->
20
30.
heat added (kJ/mol)
Use this graph to answer the following questions:
What is the melting point of X?
80 °C
What phase (physical state) of X would
you expect to find in the flask after
7 kJ/mol of heat has been added?
(check all that apply)
solid
liquid
gas
13