Molar mass calculation

[draikens]

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

 

[Chestermiller]

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?

 

[draikens]

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.

 

[Borek]

232 grams of oxygen is how many moles?

 

[draikens]

232 grams of oxygen is how many moles?

14.50054377039141 moles (oxygen) 232 g of oxygen
54.830902353873405 moles (nitrogen) 768 g of nitrogen

 

[draikens]

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?

 

[draikens]

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

 

[Chestermiller]

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?

 

[draikens]

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

 

[Chestermiller]

molar mass for oxygen is 16
molar mass for nitrogen is 14

Wrong. Molar mass of O2 is?