gases question

[yingao]

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which of the following could be used to estimate the value of absolute zero?

a. Plot pressure vs. temperature values for an ideal gas at constant volume, and extrapolate the resulting line to low temperatures. The intercept with the temperature axis is an estimate of absolute zero

b. Plot volume vs. temperature values for an ideal gas at constant pressure, and extrapolate the resulting line to low temperature. The intercept with the temperature axis is an estimate of absolute zero

c. allow both volume and pressure to vary, and plot the product of pressure and volume vs. temperature. The interccept with the temperature axis is an estimate of absolute zero

d. all above.


note: I dont understand the question and what is the value of absolute zero?

 

[circulus vitios]

I had to Google it. Constant volume keeps the moles of gas constant. Plotting pressure versus temperature works because of Gay-Lussac's law. Here's an experiment doing it: http://www.carolina.com/category/teacher+resources/classroom+activities/gay+lussacs+law.do

 

[circulus vitios]

Absolute zero is 0 Kelvin by the way.