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Gas Laws

If 0.5 mol of nitrigen gas occupies a volume of 11.2 L at 0 degrees Celsius, what volume will 2 mol of nitrogen gas occupy at the same temperature and pressure?
 

LowlyPion

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If 0.5 mol of nitrigen gas occupies a volume of 11.2 L at 0 degrees Celsius, what volume will 2 mol of nitrogen gas occupy at the same temperature and pressure?
Welcome to PF.

What is your thinking about how to approach the problem?
 
all i really need help with is the pressure... i have the formula for the problem i think (boyle's law) but i do not know the what the pressure is...
 

LowlyPion

Homework Helper
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all i really need help with is the pressure... i have the formula for the problem i think (boyle's law) but i do not know the what the pressure is...
What happens when you divide one equation by the other?
 
i dont know...boyles law states P x V = constant....and i dont know what the pressure is
 
is 44.8 L/mol is the answer?
 

nicksauce

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I would almost agree, but it asks for the volume it occupies, not the volume per mol. I get 44.8 L as an answer.
 

nicksauce

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i dont know...boyles law states P x V = constant....and i dont know what the pressure is
I don't think Boyle's law applies if the amount of material changes. I would think the ideal gas law should be applied instead. PV=nRT (n = number of moles, R = gas constant, T = temperature).
 
alrighty, thanks...
 
Should Boyle's Law be used in this problem, since the temperature remains constant:

What is the volume of an ideal gas at 1 atm, 12 L, and 25 degrees Celsius if the pressure is decreased to 0.8 atm at 25 degrees Celsius?
 

nicksauce

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Yes.
 
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May I recommend that instead of memorizing or search for different laws for different problems you could simply ALWAYS apply the Ideal Gas Law since ,Charles', Boyles' and Avagadro's Laws are simply special cases of the I.G. Law.
 

LowlyPion

Homework Helper
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Should Boyle's Law be used in this problem, since the temperature remains constant:

What is the volume of an ideal gas at 1 atm, 12 L, and 25 degrees Celsius if the pressure is decreased to 0.8 atm at 25 degrees Celsius?
Strictly speaking you should consider using the Ideal Gas Law PV = nRT.

To find unknowns in situations that some things change and others don't, then divide the two equations such that

P1V1/P2V2 = n1R1T1/n2R2T2

Just cross out the things that don't change between 1 and 2.
 
is the answer v2=15 L?
 
yes, is that the answer to the following: What is the volume of an ideal gas at 1 atm, 12 L, and 25 degrees Celsius if the pressure is decreased to 0.8 atm at 25 degrees Celsius?
 
yes, is that the answer to the following: What is the volume of an ideal gas at 1 atm, 12 L, and 25 degrees Celsius if the pressure is decreased to 0.8 atm at 25 degrees Celsius?
 

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