At 760 torr pressure and \( 20^{\circ} \mathrm{C} \) temperature, \( 1 \mathrm{~L} \) of water d...

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At 760 torr pressure and \( 20^{\circ} \mathrm{C} \) temperature, \( 1 \mathrm{~L} \) of water dissolves \( 0.04 \mathrm{gm} \) of pure oxygen or \( 0.02 \) gm of pure nitrogen. Assuming that dry air is composed of \( 20 \% \) oxygen and \( 80 \% \) nitrogen (by volume), the masses (in \( \mathrm{g} / \mathrm{L} \) ) of oxygen and nitrogen dissolved by \( 1 \mathrm{~L} \) of water at \( 20^{\circ} \mathrm{C} \) exposed to air at a total pressure of 760 torr are respectively :
(a) \( 0.008,0.016 \)
(b) \( 0.016,0.008 \)
(c) \( 0.16,0.08 \)
(d) \( 0.04,0.02 \)
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