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Ideal Gas Law

  • Thread starter chawkdee
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  • #1
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If anyone has time, could you please show me the working of this problem.

Greatly appreciated


b]1. Homework Statement [/b]
If I have an unknown quantity of gas at a pressure of 1.2 atm, a volume of 31 liters, and a temperature of 87C, how many moles of gas do I have?


Homework Equations



PV=nRT=NkT

The Attempt at a Solution



1.2 x 31=n8.3145 x (87+273)= N x 1.38066x10*23 x (87+273)

Can you tell me if the above numbers are correct please.
 

Answers and Replies

  • #2
Andrew Mason
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If anyone has time, could you please show me the working of this problem.

Greatly appreciated


b]1. Homework Statement [/b]
If I have an unknown quantity of gas at a pressure of 1.2 atm, a volume of 31 liters, and a temperature of 87C, how many moles of gas do I have?


Homework Equations



PV=nRT=NkT

The Attempt at a Solution



1.2 x 31=n8.3145 x (87+273)= N x 1.38066x10*23 x (87+273)

Can you tell me if the above numbers are correct please.
You have to stick to MKS units. Volume has to be in m^3 not litres. Otherwise, it looks fine.

AM
 
  • #3
180
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The pressure should be in pascals as well.
 
  • #4
Andrew Mason
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The pressure should be in pascals as well.
Of course! Thanks for catching that.

AM
 
  • #5
Redbelly98
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... how many moles of gas do I have?


Homework Equations



PV=nRT=NkT
Given what is being asked, would you use nRT or NkT here?
 
  • #6
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Given what is being asked, would you use nRT or NkT here?
nRT ??
 
  • #7
Redbelly98
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Why do you think that ... or is it just a random guess? The key here is: what do n and N mean?
 
  • #8
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Why do you think that ... or is it just a random guess? The key here is: what do n and N mean?
n - number of moles

N - number of molecules
 
  • #9
Redbelly98
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Okay, yes. n is the number of moles, so PV=nRT is the thing to use here.

Just be careful with the units, as others said earlier.
 

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