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Homework Help: Find the amount of energy per gram in various types of nuts

  1. May 26, 2009 #1
    1. The problem statement, all variables and given/known data

    We lit the nuts on fire and used them to heat up the water which was in an aluminum can. We then recorded the temperate. How would I find the energy?

    an example of the results would be
    mass of nut before- 1.53g
    temp of water before-23C
    mass of nut after - .19g
    temp of water after- 58C

    2. Relevant equations
    q=mc delta T

    3. The attempt at a solution

    Im really just not sure how to set up the eqaution. I know I use

    mc delta T but Im not sure what to do with the mass
  2. jcsd
  3. May 26, 2009 #2


    User Avatar
    Science Advisor
    Homework Helper

    You need to know the mass of water.
    The Equation q = mcT is th energy needed to heat a mass of water 'm' through T kelvin

    If you want bonus marks you also need the mass of the aluminium can and 'c' for aluminium.
  4. May 26, 2009 #3
    As response to the last post, the mass of the wate was 100g and the mass of the can was 79.03
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