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AAMC 5R - heat capacity = specific heat?

Discussion in 'MCAT Discussions' started by Dr. Gigglez, Aug 12, 2006.

  1. Dr. Gigglez

    Dr. Gigglez Member
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    hey guys,

    i just want to double check: heat capacity = the specific heat X the mass right?

    anybody else notice this problem from the 5R? (PS question 48) :confused:
     
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  3. kaml20

    kaml20 Member
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    wheres change in temperature?

    what question are you asking about?
     
  4. kaml20

    kaml20 Member
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    heat = heat capacity * mass * temp change

    make sure you have 4*10^-3
     
  5. Foolins

    Foolins Member
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    you're right. The "specific" in specific heat capacity just means per unit of mass. So heat capacity is multiplied by the mass. I hope it's all in grams.
     
  6. Dr. Gigglez

    Dr. Gigglez Member
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    hey kaml20,

    thanks for the quick response, but what i meant is that since they give you the heat capacity, why do you have to multiply by the mass again, since isn't the definition of heat capacity, the specific heat X mass? (or am i mistaken?)

    heat = specific heat * mass * temp change

    is the same as

    heat = heat capacity * temp change?


    does the heat capacity just equal the specific heat?
    or does it equal the specific heat X mass?
     
  7. Dr. Gigglez

    Dr. Gigglez Member
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    if you look at 5R/PS/48, they treat the heat capacity as the specific heat - is this an AAMC mistake?
     
  8. kaml20

    kaml20 Member
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    i see what your saying now, and now im confused lol
    its probably mislabled but the units arent which is wierd.
     
  9. estairella

    estairella Senior Member
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    It's an incorrect label, but I don't think you REALLY need to know the difference between heat capacity and specific heat (capacity), other than how to use them (and that one is extensive, while the other is intensive).

    In this case, solve by looking at the units (its units clearly show that it is the specific heat... and if you tried solving without mass, you wouldn't get any of those answers), instead of with your memorized equations (which, btw, are correct).
     
  10. Dr. Gigglez

    Dr. Gigglez Member
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    thanks guys!
     
  11. Knickerbocker

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    When I came across that problem, I couldn't remember the exact way to work it. But here's a tip that works for a lot of problems. Pay very close attention to the units of both what the answer should be and the values you have to work with. A lot of times all you need is a little dimensional analysis to solve the problem.
     

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