Determine the latent heat of an unknown substance

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SUMMARY

The discussion focuses on calculating the latent heat of an unknown substance X, given that 3.0g of the substance is vaporized over 1.5 hours using an energy source of 10 kcal/hr. The relevant formula for this calculation is Q = cmΔT, where Q represents the heat energy, c is the specific heat capacity, m is the mass, and ΔT is the change in temperature. Participants emphasize the need to determine ΔT to find the latent heat (Lv) of the substance accurately.

PREREQUISITES
  • Understanding of thermodynamics principles
  • Familiarity with the formula Q = cmΔT
  • Knowledge of latent heat concepts
  • Basic skills in algebra for solving equations
NEXT STEPS
  • Research the concept of latent heat and its significance in phase changes
  • Learn how to apply the formula Q = cmΔT in practical scenarios
  • Study methods for measuring specific heat capacity of substances
  • Explore energy transfer calculations in thermodynamic processes
USEFUL FOR

This discussion is beneficial for students studying thermodynamics, educators teaching heat transfer concepts, and anyone involved in experimental physics or chemistry related to phase changes of substances.

dhkdl1
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I need to determine the latent heat of an unknown substance X in kcal/g if 3.0g of boiling liquid X are completely vaporized in 1.5 hours by an energy source of 10kcal/hr.


Thanks a million!


Dave
 
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Welcome to the PF, dhkdl1. Homework and coursework questions like this need to be posted in the appropriate forum in the Homework Help section of the PF, and not in the general technical forums. I've moved your thread to the Homework Help forums, leaving a redirect in the general technical forum.

And on questions like these, you are required to show us the relevant equations and some of your own work, in order for us to be able to provide some tutorial help to you.

So what equations do you think apply here?
 
still need help!

dhkdl1 said:
I need to determine the latent heat of an unknown substance X in kcal/g if 3.0g of boiling liquid X are completely vaporized in 1.5 hours by an energy source of 10kcal/hr.


Thanks a million!


Dave

The formula my book show for Q=cmdelta T, I guess what I reaaaallllyyy need to know is how to find deltaT given the above problem and then the Lv(latent heat of the unknown substance). This too is a distance learning experience. So please point me in the right direction
 

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