A chemistry problem by PSN murthy
Chemistry
Level
pending
.If dry air is considered to have only nitrogen and oxygen and is found to have average molecular mass 28.84. What is the composition of dry Air?
21.6%
22%
19%
21%
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1 solution
asumtion faction O2 = x and N2 (1-x)
32(x) + 28(1-x) = 28.84 32x + 28 - 32x = 28.84 4x = 0.84 x = 0.21
% = mass / mass total x 100% % = 0.21 v/1 x 100% % = 21%