What is the mass of a gas sample at STP?

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Homework Help Overview

The discussion revolves around determining the mass of a helium gas sample at standard temperature and pressure (STP), specifically when the volume is given as 44.8 liters. Participants are exploring the relationship between volume, moles, and mass of gases under these conditions.

Discussion Character

  • Exploratory, Conceptual clarification, Problem interpretation

Approaches and Questions Raised

  • The original poster attempts to calculate the mass based on the volume of helium but expresses uncertainty about their answer. Other participants question how to convert the volume of gas to moles and raise the need for additional information to proceed with the calculation.

Discussion Status

Participants are actively engaging with the problem, with some providing information about the volume occupied by one mole of an ideal gas at STP. There is no explicit consensus yet, but guidance has been offered regarding the relationship between volume and moles.

Contextual Notes

There is a noted lack of information regarding the conversion of volume to moles, which is central to solving the problem. The original poster also indicates confusion stemming from the initial assumptions made about mass and atomic weight.

Dx
Hi!

A simple He occupies 44.8L at STP. what is the mass of the sample?

my answer was 4g since the atomic mass is 4u but I am wrong. someone/anyone enlighten me towards the right path so I may be one again.
Thanks!
Dx :wink:
 
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44.8 L at STP is how many moles?
 
Originally posted by Bystander
44.8 L at STP is how many moles?

I donno? the question doesn't say. nor can i find out how to compute that since i don't have the mass.
 
Somewhere in the text or lectures for your course, it has been stated, " One mole of an ideal gas occupies 22.4 L at STP." If it ain't been said outright to you previously, it has now. One mole also contains Avogadro's number of molecules, 6.02x10E23. This should have you in business on this and your other posted question. If not, holler.
 

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