Confusion About One of the Answers to an Example Done in Lecture

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Hena Sihota 1L
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Confusion About One of the Answers to an Example Done in Lecture

Postby Hena Sihota 1L » Fri Jan 19, 2018 5:37 pm

I was looking back through my notes and I was confused by one of the answers given to an example in lecture. Professor Lavelle went over the example "98 kJ of heat are required to raise the temperature of some ethanol by 2 degrees Celsius. What is the heat capacity for this ethanol?", and the answer was given as " (98/2)=49 kJ.(degrees Celsius)-1 or kJ.K-1." Why is the answer the same (49) for both kJ.(degrees Celsius)-1 and kJ.K-1?

Lisa Tang 1C
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Re: Confusion About One of the Answers to an Example Done in Lecture

Postby Lisa Tang 1C » Fri Jan 19, 2018 5:45 pm

The answer is 49 kJ/degree for both Kelvin and Celsius because both temperature scales are scaled the same. A rise of one degree Celsius is equal to a rise of one degree Kelvin. However, this would not be the case for Fahrenheit. Hope that is helpful!

Hellen Truong 2J
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Re: Confusion About One of the Answers to an Example Done in Lecture

Postby Hellen Truong 2J » Sat Jan 20, 2018 2:46 pm

To convert from Celsius to Kelvin, you just need to add 273.15, so that's why!


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