Multiple choice

Which among the following is the average composition of dry air?

  1. N2 = 55%, O2 = 40%, Argon = 1%, CO2 = 3% and other gases = 1%

  2. N2 = 85%, O2 = 12 %, Argon = 2%, CO2 = 0.5% and other gases = 0.5%

  3. N2 = 75%, O2 = 20.95 %, Argon = 0.93%, CO2 = 0.03% and other gases = 0.01%

  4. N2 = 73%, O2 = 19.75%, Argon = 2.4%, CO2 = 0.09% and other gases = 1.52%
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C Correct answer
Explanation

The average composition of dry air is N2 = 75%, O2 = 20.95%, Argon = 0.93%, CO2 = 0.03% and other gases = 0.01%.

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