Latent heat of vaporisation question

  • Thread starter lionely
  • Start date
  • #1
lionely
576
2

Homework Statement


A pupil performing an experiment finds that, when the heat supply is 16W, it takes 30 mins for the temp of the water to rise from 20°C to 100°C, and that the rate of evap is very
slow even at the latter temp. Estimate an upper limit to the value of the heat capacity of the inner flask and its contents. Calculate the mass of water collected after 30mins of steady boiling when the power supply is 60W.

(lv of water = 2.26 x 10^6 J/Kg)



The attempt at a solution

For the upper limit i did this
total heat supplied= 16 x 30 x 60= 28,880J

C= E/Δt= 28,800/80 = 360 J/K.

Now for the mass of water I get confused with what to do
 

Answers and Replies

  • #2
LawrenceC
1,198
5
Does the problem as reproduced here on this forum include all the information provided in the original problem statement?
 
  • #3
lionely
576
2
Nevermind I figured it out. xD
 

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