Identify the Gas at STP: 2.75 L & 5.39 g

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Discussion Overview

The discussion revolves around identifying a gas at standard temperature and pressure (STP) based on its volume (2.75 L) and mass (5.39 g). Participants explore the application of the ideal gas law and molar volume concepts to determine the identity of the gas from a provided list of options.

Discussion Character

  • Homework-related, Mathematical reasoning

Main Points Raised

  • One participant suggests using the ideal gas law, PV=nRT, to approach the problem, although they express uncertainty about its sufficiency.
  • Another participant confirms that using the ideal gas law is appropriate but does not elaborate on how to apply it effectively.
  • A question is raised about the relevance of the molar volume of a gas at STP, specifically that 1 mol of gas occupies 22.4 L.
  • There is a suggestion that using the molar volume is equivalent to applying the ideal gas law under standard conditions.

Areas of Agreement / Disagreement

Participants generally agree on the relevance of the ideal gas law and the concept of molar volume at STP, but there is no consensus on the specific steps needed to solve the problem.

Contextual Notes

Participants have not provided a complete solution or detailed calculations, and there are unresolved assumptions regarding the application of the ideal gas law and the definition of standard temperature and pressure.

Who May Find This Useful

Students or individuals interested in gas laws, stoichiometry, and identification of gases in chemistry may find this discussion relevant.

Oblivion77
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Homework Statement



At STP, 2.75 L of a gas weighed 5.39 g. The gas could be

a) N2
b) N2O
c) NO
d) F2
e) NF3

Homework Equations



I was thinking PV=nRT but it might not be.

The Attempt at a Solution



Nothing really.

Thanks!
 
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Oblivion77 said:
I was thinking PV=nRT but it might not be.

That's the right one, although not sufficient one.

Nothing really

Get back once you try.
 
Borek said:
That's the right one, although not sufficient one.



Get back once you try.


Do I need to use the fact that 1mol = 22.4L at STP?
 
Oblivion77 said:
Do I need to use the fact that 1mol = 22.4L at STP?

You may, although that's equivalent of using PV=nRT and entering standard TP (whatever that means).
 

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