Chantelle W.

asked • 09/28/16

Gas Law Problem #2 - Use an Equation

A container containing 5.00 L of a gas is collected at 100 Kelvin and then allowed to expand to 20.0 L. What must the new temperature be in order to maintain the same pressure? (That means pressure is constant). - Show Work

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Gina F. answered • 09/28/16

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you need to use Charles' Law which is V1/T1=V2/T2  you are given V1 and T1, initially.  
You are then given V2 but you need to find T2.  
 
Rearranging the equation to read T2=V2*T1/V1 to solve for T2.  Plug your values in....and voila!
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Lee S.

Wait, but Charles' Law says volume increases then the temperature increases but if I put in the information given, I get a temperature of 40 Kelvin which is decreasing......?????
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09/28/16

Gina F.

I think you did the math wrong.  if you have 20*100/5 you get 400K
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09/28/16

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