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CBSE Class 11-science Answered

A sample contain 80% of n2 and 20% mole of O2. find molar mass
Asked by Vidhi.ozar | 24 Jul, 2018, 07:02: AM
answered-by-expert Expert Answer
Given:
 
N2 = 80%
 
O2 = 20%
 
Molar mass=?
 
80 percent sign space straight N subscript 2 space and space 20 percent sign space straight O subscript 2 space means comma 80 space straight g space of space straight N subscript 2 space and space 20 space straight g space of space straight O subscript 2 space in space 100 space ml 80 space straight g space straight N subscript 2 space equals space 80 over 14 space moles space space space space space space space space space space space space space equals 5.7 space moles 20 space straight g space straight O subscript 2 space equals 20 over 32 space moles space space space space space space space space space space space space space space equals space 0.625 space moles Total space moles space in space mixture space equals space 6.325 space moles space 6.325 space moles space equals space 100 space gm 1 space mole equals space Molar space mass space space space space space space space space space space equals space fraction numerator 1 cross times 100 over denominator space 6.325 space end fraction space space space space space space space space space space space equals 15.18 space straight g
 
Molar mass is 15.18 
Answered by Varsha | 24 Jul, 2018, 12:17: PM

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