science

posted by zee

How many calories will it take to raise the temperature of a 36 g gold chain from 20°C to 110°C?

  1. bobpursley

    heat=mass*specific heat capacity*changeintem
    changeintemp=90C
    specificheatcapacitygold=0.129 J/gC
    but one Joule=0.239 calorie , so
    specificheat capacity gold= = 0.0308 cal/gC
    mass=36g
    do the math.

  2. zee

    My answer is 1.1088 because the specific heat capacity gold times the mass, is that the right answer.
    0.0308 times the mass of 36 g

  3. DrBob222

    No, that isn't correct. What did you do with the change in temperature of 90 C?

  4. zee

    Ok, I tried 0.0308 times the mass of 36g divided by 90C, I got .0516, is that correct? Not sure what to do? Thanks

  5. bobpursley

    Multiply by change in Temp. * means times. I get near 100 Joules

  6. zee

    137, I just multplied

  7. DrBob222

    0.0308 x 36 x 90 = ? calories

    I don't think that's 137.

  8. zee

    I got 99.792, then rounded to 99.8

  9. zee

    Got it! Thanks

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