# 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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