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Amount of energy rerquired to raise temperature

  1. Apr 4, 2012 #1
    1. The problem statement, all variables and given/known data
    What amount of energy is required to raise the temperature of 12.0 kg of water
    from 0 degrees Celsius to 25 degrees Celsius?


    2. Relevant equations
    Q = m*c*ΔT
    1 calorie = 4.186J
    specific heat capacity for water = 4.19x10^3


    3. The attempt at a solution
    Q = m*c*ΔT = (12kg)(4.19x10^3)(25°) = 1,257,000J
    1257000J/4.186 = 300,286 calories
     
  2. jcsd
  3. Apr 4, 2012 #2

    gneill

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    Staff: Mentor

    Did you have a question about your method or result?
     
  4. Apr 4, 2012 #3
    both.
    another method i found online was to do (12000grams)*1cal/(g*K)*25 = 300,000 calories which is close to my first result. also i wasnt sure if the answer should be in joules or calories.
     
  5. Apr 4, 2012 #4

    gneill

    User Avatar

    Staff: Mentor

    Both methods amount to the same thing. As for the units of the result, that depends upon who is asking the question and what units they expect the answer to be in :smile: The calorie is a unit of energy, as is the Joule.
     
  6. Apr 4, 2012 #5
    ok thanks
     
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