2.16 - recall the gases present in air and approximate percentage by volume
It's pretty simple. Just remember the percentages :D (I'm sorry, I have no other ways to help.)
Oxygen = around 21%
Nitrogen = around 79%
Carbon dioxide = 0.04%
And the rest are our nobler gases :) for example argon :O (water vapor and stuff are there too)
2.17
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