Asked by danny123

A sample of gas confined in a cylinder with a movable piston is kept at constant pressure. The volume of the gas doubles when the temperature of the gas is changed from

a. 200. K to 400. K
b. 200. C to 400. C

How do you know if it's kelvin or celsius?
k= c + 273, by the way.

Answers

Answered by DrBob222
You solve the problem which ALWAYS comes out in Kelvin because you may use ONLY Kelvin in the solution. The volume doubles when the Kelvin T doubles and is halved when the Kelvin T is halved.
Doubling the celsius, by the way, will NOT double the volume and you can prove that by the following:
Suppose we let V1 = 10 mL, then
(V1/T1) = (V2/T2)
(10/20 K) = (V2/40 K)
V2 = 10mL*(40/20 = 20 mL (double T doubles V) BUT
from 20 celsius to 40 celsius is from 293 K to 313 K and
(10/293) = (V2/313)
V2 = 10 mL*(313/293) = 10.7 mL. See. Not even close.
Answered by danny123
thanks
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