### Experiment on Heating a Pure Sample of Substance XA pure solid sample of Substance X is placed into an evacuated flask. The flask is heated at a steady rate, and the temperature is recorded as time progresses. Below is an analysis of the results based on the provided graph.#### Graph Description:- **Axes:** - The vertical axis represents the **temperature (°C)**. - The horizontal axis represents the **heat added (kJ/mol)**.- **Data Trend:** - Initially, the temperature rises steeply from 10°C. - At approximately 10 kJ/mol, the graph shows a plateau at around 40°C, indicating a phase change where the substance is transitioning from solid to liquid. - The temperature remains constant until about 20 kJ/mol of heat is added. - The temperature then rises steadily to approximately 130°C, indicating the heating of the liquid phase. - A second plateau is observed at this temperature, suggesting another phase change, likely from liquid to gas, persisting until about 40 kJ/mol. - After this point, the temperature increases again as the gas phase is heated.#### Questions:1. **What is the boiling point of X?** - Answer is indicated by the second plateau, approximately **130°C**.2. **What phase (physical state) of X would you expect to find in the flask after 19 kJ/mol of heat has been added?** - Consider the plateau from approximately 10 kJ/mol to 20 kJ/mol. The substance is likely in the **liquid** phase at 19 kJ/mol.These observations help in understanding the transitions between different states of matter as heat is added to a substance.

The solid substance, X, changes to liquid first and then the liquid changes its phase to gas as the heat is added.Solid -> liquid -> gasThe first phase change in the graph is from solid to liquid and the second phase change is from liquid to gas. Heat supplied to the substance is being consumed during the phase change process that keeps the temperature constant where it is, For any substance the temperature stays constant during the change of state.At the boiling point, the heat supplied is utilized for change of phase from liquid to gas . Therefore, the temperature of the substance does not increase until all the liquid is converted to gas. Once all the liquid is converted to gas, the temperature starts increasing again as the heat is added. In other words, the horizontal line to x-axis at 115°C in the graph represents the boiling point because the temperature is constant for a period of time that corresponds to the phase change from liquid toAnswer: boiling point of X is 115°CIn the graph, the 19 kJ/mol heat corresponds to the boiling point i.e 115°C . At the boiling point ( 115°C ) liquid and gas phases of the compound X are in Equilibrium. So from this we get that , Both Liquid and solid are present in the flask when 19 KJ/mol heat is added in the flask . phase (physical state) of X in the flask after 19kJ/mol of heat has been added are Liquid and gasBoiling point of X is 115°CPhase - Liquid and gas

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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: 130. 110. 90. temperature (°C) 70. 50. 30. 10. 10. What is the boiling point of X? 20 30. heat added (kJ/mol) Use this graph to answer the following questions: What phase (physical state) of X would you expect to find in the flask after 19 kJ/mol of heat has been added? °C (check all that apply) O solid Oliquid Ogas X 40 5 50 Rights Reserved. Terms of Use | Privacy Center Accessibility

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: 130. 110. 90. temperature (°C) 70. 50. 30. 10. 10. What is the boiling point of X? 20 30. heat added (kJ/mol) Use this graph to answer the following questions: What phase (physical state) of X would you expect to find in the flask after 19 kJ/mol of heat has been added? °C (check all that apply) O solid Oliquid Ogas X 40 5 50 Rights Reserved. Terms of Use | Privacy Center Accessibility

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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