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Q.

Air is a mixture of  O2 and  N2 .Air contains 80% N2 and 20%  O2 by mole.What is the  Average molecular weight of Air

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a

28.8             

b

30.2

c

27.8        

d

29.0       

answer is A.

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Detailed Solution

Mavg=80×28+20×32100 =28.8

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