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How many molecules of CO2 are present in...

How many molecules of `CO_2` are present in one litre of air containing `0.03%` volume of `CO_2` at N.T.P.?

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100 L of air contain `CO_2` at N.T.P. = 0.03 L
1 L of air contain `CO_2` at N.T.P = 0.03/100 L
22414 L of ` CO_2` at N.T.. Contain `6.022 xx 10^23` molecules
0.03/100 L of ` CO_2` at N.T.P contain `(6.022xx10^23xx0.03)/(22.414xx100)` molecules = `8.07xx10^18` molecules.
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