Whats the materials specific heat capacity?

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Homework Help Overview

The discussion revolves around calculating the specific heat capacity of a material based on the heat added and the temperature change. The original poster presents a scenario involving heat transfer and temperature change, seeking confirmation of their calculated specific heat capacity.

Discussion Character

  • Exploratory, Assumption checking, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the application of the formula for specific heat capacity and question the accuracy of the original poster's calculations. There is an exploration of unit conversions and the impact of rounding on the results.

Discussion Status

The discussion is active, with participants sharing their calculations and questioning each other's methods. Some have acknowledged similar results, while others are still clarifying their approaches and assumptions without reaching a definitive consensus.

Contextual Notes

There is mention of unit conversion from Fahrenheit to Celsius, which may affect the calculations. The original poster expresses uncertainty about their previous attempts, indicating a struggle with the problem setup.

Dx
Hello,

150kcal of heat raises the temp of 2.0kg of material by 400 degrees F. Whats the materials specific heat capacity?

I cam up with 1.35 kcal/kg degrees C. is this correct?

Thanks!
Dx :wink:
 
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Dx,

That's not what I get. Can you show me what you did?

Thanks,
 
I used some substitution

Originally posted by Tom
Dx,

That's not what I get. Can you show me what you did?

Thanks,

No problem, Tom! I meant to say .34 kcal/fg oC was my answer sorry that's another problem i am working on but i got it wrong anyways, lol.

I used the formula [del]Q = mc [del]T and substituted.
c = 150kcal / (2kg)* (190oC) =
.34 kcal

i figured it was .34 since when i converted from F to C i rounded the number so then I usd scientific notation to conclude to this answer.
I am sorry but I have reworked this problem many times erasing and adding to it so excuse me if its not exact but you can see I am really trying here.
Thanks!
Dx
 
OK, that's what I got too.

I was thinking you had made a mistake converting ΔTF to ΔTC (because you have to multiply by 5/9), but then I reworked the problem by making that mistake, and I still did not get your answer.

Oh well, that's cleared up now.
 
TY Tom

Just wanted to say thanks!
 

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