As part of my AS Physics homework a week or so ago, I was set the question:(adsbygoogle = window.adsbygoogle || []).push({});

3. A fixed mass of gas has a volume of 144 cm3 at 15ºC. Calculate its volume at

(a) 33ºC

(b) 0ºC, and

(c) -67ºC (the pressure being constant).

Yesterday the whole class was asked to re-attempt questiosn 3 and 4 using temperatures in Kelvin instead of Celcius.

When I was trying to figure out the question the first time around I tried using K but found that the answers didn't make logical sense as I thought that as temperature increases so does the volume of gas.

Originally, I used V = kT and calculated k to be 9.6. I the got the three answers to equal 317, 0 and -643 cm^3. Obviously, I now know that this is wrong.

However, whenever I try to calculate the answer using a temp. in Kelvin (by adding 273 degrees to the celcius temp), I get k to equal 0.5 and this figure makes the volume decrease as temp. increases.

Can anyone please tell me what I'm doing wrong?

Cathy

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# Homework Help: Help required with gas law questions

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