Latent Heat

  • Thread starter tornzaer
  • Start date
  • #1
77
0

Homework Statement


What is the energy released as water changes temperature from 20C to -10C?


Homework Equations


mct+lfm+mct


The Attempt at a Solution


My physics exam is day after tomorrow, however, I have no clue about this question. I was away for a week during these lessons. Can someone please walk me through the question so I can understand.

Thank you very much.
 

Answers and Replies

  • #2
rock.freak667
Homework Helper
6,223
31
Assuming no heat losses. All the energy released goes into reducing the temperature from 20C to 0C and changing the water's phase and then lowering the temperature of the ice from 0C to -10C
 
  • #3
77
0
Well yes, but how would I set up the equation?
 
  • #4
rock.freak667
Homework Helper
6,223
31
[tex]Energy=m_w c_w \Delta \theta_w + m_w l_f +m_ic_i \Delta \theta_i[/tex]

i=ice,w=water.
 
  • #5
77
0
Can you please plug in the digits? I am confused about the temperatures.
 
  • #6
rock.freak667
Homework Helper
6,223
31
[tex]Energy=m_w c_w \Delta \theta_w + m_w l_f +m_ic_i \Delta \theta_i[/tex]

i=ice,w=water.

for the change in temperature of the water it is (20-0)C and for ice it is (0-(-10))=10C.
 

Related Threads on Latent Heat

  • Last Post
Replies
3
Views
1K
  • Last Post
Replies
5
Views
1K
  • Last Post
Replies
8
Views
2K
  • Last Post
Replies
6
Views
2K
  • Last Post
Replies
2
Views
1K
  • Last Post
Replies
3
Views
1K
  • Last Post
Replies
6
Views
871
  • Last Post
Replies
8
Views
6K
Replies
2
Views
6K
  • Last Post
Replies
1
Views
2K
Top