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Q.

What is the mass of 5 moles of N2 (nitrogen) gas?

(Molar mass of N2 is 28g)

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Detailed Solution

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 Number of moles of nitrogen= 5

Formula:  

Number of moles  = Mass of substance (m)Molar mass of given substance (M)   

Solution:

 Molar mass of Nitrogen atom (M)= 14g  

Nitrogen is diatomic so, molar mass of N2 = 14X 2 = 28g

Number of moles of nitrogen = Mass of nitrogen (m)Molar mass of nitrogen (M)   

                                                  5 =  m28 

                                                   5X28  =  m

                                                m =  140g

Mass of 5 moles of N2  gas = 140g.

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