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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
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