- #1
benji
- 48
- 0
Here's the question:
I used Q=mc (delta)T.
So Q + Q = 0. I put the properties of the coffee in one and the properties of the glass in another. Since I couldn't find a specific heat for coffee I just used that of water (I figure they're pretty similar?)...
Anyway, for my final answer u git 39.42C when it should be something like 73C.
I don't understand this stuff too well yet, so it's probably a logic mistake on my part, but if someone could explain that to me I'd really appreciate it. Thanks.
Also... (I figured I'd just add on to this post instead of creating another thread...) How would I go about doing this one:
You pour 150 g of hot coffee at 86C into a 200 g glass cup at 22C. If they come to thermal equilibrium quickly, what is the final temperature?
I used Q=mc (delta)T.
So Q + Q = 0. I put the properties of the coffee in one and the properties of the glass in another. Since I couldn't find a specific heat for coffee I just used that of water (I figure they're pretty similar?)...
Anyway, for my final answer u git 39.42C when it should be something like 73C.
I don't understand this stuff too well yet, so it's probably a logic mistake on my part, but if someone could explain that to me I'd really appreciate it. Thanks.
Also... (I figured I'd just add on to this post instead of creating another thread...) How would I go about doing this one:
Two hundred fifty grams of water at 80C is poured into a Styrofoam cup of negligible heat capacity containing 180 g of water at 10C. After an additional 300 g of water is added to the cup, the mixture come to an equilibrium temperature of 30C. What was the temperature of additional 300 g of water?
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