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!

Heat phenomena

  1. Apr 25, 2012 #1
    1. The problem statement, all variables and given/known data

    An aluminum vessel hose mass is 178g contains 90g of water at 15.5°C. How many calories of heat are required to bring the water to a final temperature of 85°C? The specific heat of water is 1cal/g°C.

    Given:
    mAl=178g
    mH2O=90g
    T1=15.5°C
    T2=85°C
    cH2O=1cal/g°C

    2. Relevant equations
    Im planning to use this formula for heat quantity

    QH2O=mH2OcH2OΔTH2O

    where ΔTH2O=T2-T1


    3. The attempt at a solution
    Since what we need is QH2O i just ignore mAl, using the above formula i got

    QH2O=(90g)(1cal/g°C)(85-15.5)°C=6300cal

    is this correct?
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Apr 26, 2012 #2

    gneill

    User Avatar

    Staff: Mentor

    You're halfway there :smile: What about the enclosing aluminum vessel? Doesn't its temperature have to be raised to the final value also?
     
  4. Apr 26, 2012 #3
    do i need to get QAl?
     
  5. Apr 26, 2012 #4

    gneill

    User Avatar

    Staff: Mentor

    I don't see how you can heat the water without also heating the vessel that contains it. So I'd have to say yes, you should add the heat required to raise the temperature of the aluminum vessel too.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Heat phenomena
  1. Phenomena of light (Replies: 1)

  2. Heat phenomena (Replies: 1)

Loading...