How to Calculate the Molar Heat of Vaporization of Dichloromethane?

AI Thread Summary
To calculate the molar heat of vaporization of dichloromethane (CH2Cl2), the vapor pressure at 0 degrees Celsius is given as 134 mmHg, with a normal boiling point of 40.0 degrees Celsius. The equation used involves the natural logarithm of the pressure ratio and the heat of vaporization, but the user struggles with determining the unknown pressure variable, P_2. The concept of boiling is clarified as the rapid vaporization of a liquid at its boiling point, where vapor pressure equals environmental pressure. The user ultimately finds the solution to their problem. Understanding the relationship between vapor pressure and temperature is crucial for this calculation.
Kudo Shinichi
Messages
104
Reaction score
1
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.
 
Physics news on Phys.org


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.
 

Thread 'Prove that evolution is constant (Provide at least two arguments to support your position)'

I don't get how to argue it. i can prove: evolution is the ability to adapt, whether it's progression or regression from some point of view, so if evolution is not constant then animal generations couldn`t stay alive for a big amount of time because when climate is changing this generations die. but they dont. so evolution is constant. but its not an argument, right? how to fing arguments when i only prove it.. analytically, i guess it called that (this is indirectly related to biology, im...
View full post »

Similar threads

Chemistry A calculation of enthalpy, entropy, and Gibbs energy of vaporization
Replies
1
Views
1K
Calculating Percentage of Dissociated N2O4 Molecules: Vapour Density Question
Replies
1
Views
2K
The Clausius-Clapeyron relation to study pressure cookers
Replies
2
Views
3K
Finding latent heat of vaporisation as a function of temperature
Replies
9
Views
9K
Calculate Heat of Vaporization and normal boing point (in degree C).?
Replies
2
Views
3K
Vapor pressure given boiling point and heat of vaporization?
Replies
1
Views
3K
How do you calculate density of a vapor only vapor pressure and temp.
Replies
2
Views
9K
How Does Temperature Affect Water Vapor Pressure?
Replies
2
Views
3K
Question on water vapour and pressures
Replies
4
Views
3K
Engineering How do I calculate the overall vapour flow?
Replies
2
Views
3K

Hot Threads

Recent Insights

Back
Top