How to Calculate the Molar Heat of Vaporization of Dichloromethane?

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Discussion Overview

The discussion revolves around calculating the molar heat of vaporization of dichloromethane (CH2Cl2) using its vapor pressure and boiling point. It includes elements of homework-related problem-solving and conceptual clarification regarding boiling and vapor pressure.

Discussion Character

  • Homework-related, Conceptual clarification

Main Points Raised

  • One participant presents a homework problem involving the vapor pressure of dichloromethane at 0 degrees Celsius and its normal boiling point, seeking to calculate the molar heat of vaporization.
  • The participant attempts to use the equation involving vapor pressure but expresses uncertainty about finding the unknown variable P_2.
  • Another participant asks for clarification on the meaning of boiling, which is subsequently defined by a third participant as the rapid vaporization of a liquid at its boiling point.
  • A later reply suggests that the answer to the original problem is addressed in the definition provided.
  • Finally, the original poster indicates they have obtained the answer, though no details are provided on the solution process.

Areas of Agreement / Disagreement

The discussion includes a mix of problem-solving and clarification on terminology, with no explicit consensus on the calculation method or the final answer presented.

Contextual Notes

The original post lacks specific values for P_2, which is necessary for completing the calculation. Additionally, the definitions and explanations provided may depend on varying interpretations of boiling and vapor pressure.

Kudo Shinichi
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HELP!A question on vapour pressure

Homework Statement


The vapor pressure of dichloromethane, CH2Cl2, at 0 degree Celsius is 134 mmHg. The normal boiling point of dichloromethane is 40.0 degree Celsius. Calculate its molar heat of vaporization.


Homework Equations





The Attempt at a Solution



ln(P_2/134)=(Change of H_vapour/8.314)(1/(0+273)-1/(40+273))
I still have two unknown variables...I should find change H_vapour for this question, but I don't know how to figure out P_2

Thank you for helping me.
 
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What does boliling mean?
 


Borek said:
What does boiling mean?

Boiling (also called ebullition), a type of phase transition, is the rapid vaporization of a liquid, which typically occurs when a liquid is heated to its boiling point, the temperature at which the vapor pressure of the liquid is equal to the pressure exerted on the liquid by the surrounding environmental pressure
Source: wikipedia
 


Answer to your problem is directly addressed in the quote.
 


Thanks. I have got the answer.
 

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