Angelica J.

asked • 11/29/15

Ideal gas law problem?? - CHEMISTRY

What is the temperature of methane gas (CH4) if 4.78 mol of gas are collected in 9.2 L at 789 torr? 
 
PV=nRT
 
All help is greatly appreciated!!
 
Here is what I was thinking.. but I am not sure if it is correct. 
T = PV / nR
T =(789 torr)(9.2 L) / (4.78 mol)(0.0821 Latm / mol*K) = 18496.679 = 18000 K...
 
That answer seems really big to me.. thank you for the help in advance

James M.

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Equation correct but R value in atm not torr, need to use 62.4 for numeric value of R
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12/10/20

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Julio G. answered • 11/29/15

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Convert torr into atm.  789 torr / 760 
 
Pressure has to be in atm for the ideal gas law equation to work.
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Angelica J.

Okay.. 
789 torr(1 atm/760 torr) = 1.038 atm 
 
(1.038 atm)(9.2 K) / (4.78 mol)(0.0821 Latm/molK) = 24 K (with proper sig figs)
 
Does this answer seem correct? 
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11/29/15

Julio G.

Looks Good.  I don't see anything wrong.
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11/29/15

Angelica J.

Thank you!
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11/29/15

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