If the temperature remains constant while the volume of a given amount of gas is tripled, the pressure will be

a) three times the original pressure
b) two thirds the ori..
c) one third of the ori...
d) the same as the ori...

and why, please explain. Thanks

P1V1/T1 = P2V2/T2

Since the pressure is constant e.g. = 100 K then T1 and T2 are equal and can be eliminatied from the equation. This just leaves

P1V1 = P2V2. So the pressure would be tripled. Suppose P1 was 2 and V1 was 2. Now increase the Volume by tripling it to 6 what is P2?

2 x 2 = P2 x 6

4 = P2 x 6

P2 = 4/6

P2 = 2/3

This answer is incorrect

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c) one third of the original.