Molar Mass Calc: My Solution | PDF File

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Discussion Overview

The discussion revolves around calculating the molar mass and the number of moles of gases in a mixture of air, specifically focusing on oxygen and nitrogen. Participants are attempting to solve related problems, including mole fractions and the implications of molecular composition.

Discussion Character

  • Homework-related
  • Mathematical reasoning
  • Debate/contested

Main Points Raised

  • One participant expresses uncertainty about their solution regarding the molar mass calculation.
  • Multiple participants inquire about the number of moles of oxygen and nitrogen in 1 kg of air and seek to understand mole fractions.
  • Another participant calculates the number of moles for 232 grams of oxygen and 768 grams of nitrogen, providing specific numerical values.
  • There is a question about whether to sum the moles of oxygen and nitrogen to obtain a total.
  • Some participants challenge earlier claims by asking about the number of atoms in molecular oxygen and nitrogen, as well as their respective molar masses.
  • Participants provide differing values for the molar masses of oxygen and nitrogen, with some asserting that the molar mass for O2 and N2 needs clarification.

Areas of Agreement / Disagreement

Participants do not appear to reach consensus on the correct molar masses or the calculations involved, indicating multiple competing views and unresolved questions.

Contextual Notes

Some calculations depend on assumptions about the composition of air and the definitions of molar mass for molecular forms of gases, which are not fully resolved in the discussion.

draikens
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Homework Statement
Assuming that 1 kg of dry air consists of 232 g of oxygen and 768 g of nitrogen (ignore the admixture of other gases), calculate the molar mass of the air.
Relevant Equations
M = NA(avogadro number) x mo (molecular mass)
pdf file is my solooution l think its wrong
 

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In the 1 kg of air, how many moles of oxygen are there? How many moles of nitrogen are there? What is the mole fraction of oxygen? Of nitrogen?
 
Chestermiller said:
In the 1 kg of air, how many moles of oxygen are there? How many moles of nitrogen are there? What is the mole fraction of oxygen? Of nitrogen?
L really have no idea that's why l asking you guys.
 
232 grams of oxygen is how many moles?
 
Borek said:
232 grams of oxygen is how many moles?
14.50054377039141 moles (oxygen) 232 g of oxygen
54.830902353873405 moles (nitrogen) 768 g of nitrogen
 
Last edited:
draikens said:
14.50054377039141 moles (oxygen) 232 g of oxygen
54.830902353873405 moles (nitrogen) 768 g of nitrogen
do l need to just add these together to get the result?
 
Chestermiller said:
In the 1 kg of air, how many moles of oxygen are there? How many moles of nitrogen are there? What is the mole fraction of oxygen? Of nitrogen?
14.50054377039141 moles (oxygen) 232 g of oxygen
54.830902353873405 moles (nitrogen) 768 g of nitrogen
 
draikens said:
14.50054377039141 moles (oxygen) 232 g of oxygen
54.830902353873405 moles (nitrogen) 768 g of nitrogen
Wrong. How many atoms are there in molecular oxygen? In molecular nitrogen? What is the molar mass of an oxygen molecule? Of a nitrogen molecule?
 
Chestermiller said:
Wrong. How many atoms are there in molecular oxygen? In molecular nitrogen? What is the molar mass of an oxygen molecule? Of a nitrogen molecule?
molar mass for oxygen is 16
molar mass for nitrogen is 14
 
  • #10
draikens said:
molar mass for oxygen is 16
molar mass for nitrogen is 14
Wrong. Molar mass of O2 is?
 

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