Molar Mass of Gas: Calculate at 100°C & 26.6 kPa

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Discussion Overview

The discussion revolves around calculating the molar mass of a gas given specific conditions: a volume of 2.6 L, a mass of 5.4 g, a temperature of 100°C, and a pressure of 26.6 kPa. The focus is on applying the ideal gas law and understanding the concept of molar mass.

Discussion Character

  • Homework-related
  • Technical explanation

Main Points Raised

  • One participant asks for help in resolving the problem and inquires about the necessary equations.
  • Another participant suggests using the ideal gas law, specifically the equation N=PV/RT.
  • A participant emphasizes the need to calculate the number of moles and relates it to the mass to find molar mass.
  • There is a discussion about the definition of molar mass, with some participants clarifying that it is the weight of one mole of a substance in grams.
  • One participant points out the need to convert temperature to Kelvin and pressure to atmospheres for the calculations.

Areas of Agreement / Disagreement

Participants generally agree on the use of the ideal gas law and the definition of molar mass, but there is uncertainty regarding the application of the equations and the necessary conversions.

Contextual Notes

There are unresolved aspects regarding the specific steps to take in applying the ideal gas law, including the conversions needed for temperature and pressure.

kro041193
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please help me resolving this problem :s...what do I have to do , what equations I need to use?
What is the molar mass of a gas if 2.6 L of its gas has a mass of 5.4 g at 100°C and 26.6 kPa?
 
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The ideal gas law.
 
yes but i mean how can i use it.. i know that the equation is :

N=PV/RT

but i don't really know how to answer the problem with it
 
okay so calculate the number of moles. Then it looks like what you are left with is the number of moles, and a mass

what is molar mass again?
 
the molar mass is what is asking
 
yeah I know that's what you are asking. But do you know what molar mass is? Because if you don't know what it is, that's where I would start my problem solving process
 
You have all the numbers you need; you just need to change temperature into kelvin, and pascals into atomospheres.
 
aa ok .. and no i don't know
 
Haha http://en.wikipedia.org/wiki/Molar_mass that is a link for molar mass.

but if you don't know what one of the variables in your problem is, then you should find that out. because it turns out that molar mass is literally how much 1 mole of something weighs. And in units it is grams/mole.
 
  • #10
ok thnx
 

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