Which has higher density: dry air or moist ai | vedclass

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Question

(A) Dry air has a higher density than moist air.This is because dry air consists of $N_2$ $(28 \ g/mol)$,$O_2$ $(32 \ g/mol)$,and $CO_2$ $(44 \ g/mol)

Vedclass · Accepted Answer

Dry air,because it contains heavier molecules like $N_2$ $(28)$,$O_2$ $(32)$,and $CO_2$ $(44)$.

Vedclass · Answer

(A) Dry air has a higher density than moist air.This is because dry air consists of $N_2$ $(28 \ g/mol)$,$O_2$ $(32 \ g/mol)$,and $CO_2$ $(44 \ g/mol)$,which have higher molar masses.In moist air,some of these molecules are replaced by water vapor $(H_2O)$,which has a lower molar mass of $18 \ g/mol$.According to Avogadro's law,at constant temperature and pressure,the density of a gas is directly proportional to its molar mass. Therefore,replacing heavier air molecules with lighter water vapor molecules decreases the overall density of the air.

Which has higher density: dry air or moist air? Why?

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