Asked by help

A 2.5 L balloon is filled with helium to under constant pressure at a temperature of 25 °C. The temperature remains constant, but the balloon has a leak. What is the volume of helium in the balloon when the half of the helium has escaped?

I'm confused on this question. I used avogadro's law but I can't find moles

Answers

Answered by Anonymous
Hmmm, saw one like this earlier.
P V = n R T
assume the balloon fabric is so stretchy that it has no effect on pressure.
P is one atmosphere before and after
n at the end is 1/2 the original n
R is a constant
T is the same before and after
therefore if n is cut in half, only V can change with n
so
the final V is 1/2 the original V
(you do not need the n of mols, all you need to know is that it is one half of the starting n)

Answered by DrBob222
Is something missing here? The first sentence isn't complete. If you know the volume and pressure you can calculate moles from
2.5 L x (T/273) x (760/P) x 1/22.4 = ?
Answered by help
I need to use Avogadro's Law
Answered by Anonymous
P V = n R T
is
Avagadro's law
R is a constant that depends only on what units you are using so you can say
P1 V1 / (n1 T1) = P2 V2 /(n2 T2)
Answered by Anonymous
Try using your search engine, Google or whatever, for
Avogadro's Law
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