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PennyGirl
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Homework Statement
You have a balloon (stretchy) filled with one liter of He at 1 atm and 298 Kalvin. The balloon is suddenly placed into a room at .5 atm and 298 Kalvin. What is the temperature of the gas inside the balloon a little while after this happens?
Homework Equations
P*V=n*R*T
The Attempt at a Solution
So first, I calculated the number of moles of He in the balloon, using the ideal gas law as follows...
(1 atm)*(1 L)=n*.0821*(298 K)
n=.0409 mol
Then, I said that...
P1*V1=P2*V2
(1atm)*(1L)=(.5atm)*(V2)
therefore, V2 = 2L
From there, (using ideal gas law again...)
(.5atm)*(2L)=.0409 mol(.0821)*(T)
T=298K
but this answer didn't make sense to me...shouldn't temperature in the balloon change?