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A solution contains 30% w/w NH\(_3\) (aq) (density: 0.90 g/mL). Find the mole fraction of the solution.
What is the mole percent and fraction of each component of a mixture composed of 0.200 mol O\(_2\) and 0.500 mol N\(_2\) ?
Calculate the mole fraction (and mole percent) of oxygen in exhaled air if the P\(_{O_2}\) = 760 torr and P\(_{total}\) is 1116 torr.
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