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Which is denser, moist air or dry air? (Note: density as in mass density) . 1) Moist air is denser than dry air.2) Dry air is denser than moist air.3) Dry air and moist air have the same densities.. Answer:. 2) Dry air is denser than moist air.. Moist air contains more H2O vapour than dry air. H2O has a molar mass of 18.0 g/mol, while the molar mass of air (21% O2, 79% N2) is 28.9 g/mol.One mole of dry air will take up the same volume as one mole of moist air, but will weigh more becau288

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