Chemistry Molar Mass Calc: My Solution | PDF File

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The discussion revolves around calculating the moles of oxygen and nitrogen in 1 kg of air and determining their mole fractions. Users provide calculations indicating 14.5 moles of oxygen from 232 grams and approximately 54.8 moles of nitrogen from 768 grams. There is confusion about whether to sum these values for total moles and how to correctly calculate the molar masses of O2 and N2. The correct molar mass for molecular oxygen (O2) is 32 grams, while for nitrogen (N2) it is 28 grams. The thread emphasizes the importance of accurately understanding molecular weights in these calculations.
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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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