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Answer:
40 %
Explanation:
vd O2 = 16
vd O 3 = 24
vd mix = 20
so let moles of O2 : O 3 = n : 1 ( or clearly n= 1 )
20 = ( 16 n + 24 ) / ( n + 1 )
n = 1
Therefore mass% = ( 16 n/ (16 n + 24 ) ) * (100%) = 40%
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