1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Latent heat calculation

  1. Apr 23, 2009 #1
    Latent heat calculation!!

    Ok... first timer. I am not a science student, done some MBA but wanting some IT course and for entrance exam, I am preparing. I have problem with this one problem. Just provide me a hint. I do calculation part.

    'Juice and water is produced from 5.0 liters of water, a temperature of 25 ° C. Ice is added of which temperature is -18 oC. How large ice cube mass should be in order to drink, the final mixing temperature is 10 ° C? Suppose
    to drink
    and the environment, there is no heat exchange. Juice and water
    specific heat is 4.19 kJ / (kg ° C), ice specific heat 2.2 kJ / (kg ° C) and ice
    latent heat is 333 kJ / kg. Juice and water density is 1.0 kg/dm3.'

    (i just translated this question from finnish to english, so grammar mistake is there!!)

    Please do provide me hints as to how I proceed with this question.
     
  2. jcsd
  3. Apr 23, 2009 #2

    Hootenanny

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    Re: Latent heat calculation!!

    Welcome to Physics Forums.

    What are your thoughts on the problem? What have you attempted thus far?
     
  4. Apr 23, 2009 #3
    Re: Latent heat calculation!!

    ha ha 2 hours i attempted this morning... didn't care about breakfast... now i just got it right!!

    Anyway.. kiitos (thanx)

    goes this way
    (1kg/dm3 x 5 l) x 4.19 kJ/kgC x 15 = 2.2 kJ/kgC x m x 28 + 333 kJ/kg x m

    answer is, m = 0.760 kg (but i got somewhere 0.796) ;-)
     
  5. Apr 23, 2009 #4

    Hootenanny

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    Re: Latent heat calculation!!

    My answer is the same as yours (0.796kg).
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Latent heat calculation
  1. Latent heat (Replies: 4)

  2. Latent Heat (Replies: 8)

  3. Latent heat? (Replies: 6)

Loading...