Molar mass calculation

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  • Thread starter draikens
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  • #1
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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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Answers and Replies

  • #2
20,589
4,436
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?
 
  • #3
6
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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?
L really have no idea thats why l asking you guys.
 
  • #4
Borek
Mentor
28,564
3,013
232 grams of oxygen is how many moles?
 
  • #5
6
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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:
  • #6
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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?
 
  • #7
6
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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?
14.50054377039141 moles (oxygen) 232 g of oxygen
54.830902353873405 moles (nitrogen) 768 g of nitrogen
 
  • #8
20,589
4,436
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?
 
  • #9
6
0
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
20,589
4,436
molar mass for oxygen is 16
molar mass for nitrogen is 14
Wrong. Molar mass of O2 is?
 

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