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Homework Statement
Air consists of approximately 78% Nitrogen in volume, 21% Oxygen and 1% Argon. The atomic weight of Nitrogen is approximately 14, that of Oxygen 16, and that of Argon 40.
Nitrogen occupies air in weight by
(1) (a) 76% (b) 77% (c)78% (d)79%
Homework Equations
The Attempt at a Solution
I don't know how to calculate, so I just tried
78*28 + 21*32 + 40 = 2896
78*28/2896 = 0.754 = 75.4%
what is the correct method?