- #1

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I though you could use the Ideal gas law, converting 15kg into moles, but would the volume be considered constant here? Because if not, then I do not see how you could apply it to PV= nRT.

- Thread starter hot2moli
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- #1

- 14

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I though you could use the Ideal gas law, converting 15kg into moles, but would the volume be considered constant here? Because if not, then I do not see how you could apply it to PV= nRT.

- #2

G01

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The volume is the volume of the tank itself. So, yes. The volume is constant. What isn't constant here (other than the pressure of course) is the number of mols of oxygen.

Last edited:

- #3

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and Im not getting the right answer.

P= 41atm

n= (15000g)/(16g/mol)

P2= 28

and then I solve for n2 multiplying by 16g/mol to get mass of oxygen?

WHERE I HAVE I GONE WRONG? :( PLEASE HELP!

- #4

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Remember that 41atm is the gauge pressure, not the actual pressure.

- #5

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- #6

G01

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No, the proportionality will only hole for the actual pressures, since the addition of 1 atm to the numerator and denominator of P_1/P_2 will not give the same fraction. i.e.:

[tex]\frac{P_{guage 1}}{P_{guage2}}=/=\frac{P_1}{P_2}[/tex]

Work with the actual pressures.

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