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A gaseous mixture contains 420.0 Torr of H2(g), 391.3 Torr of N2(g), and 79.5 Torr of Ar(g). Calculate the mole fraction, X, of each of these gases?
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A student finds that the mass of an object is 6.62 kg. She is told that her measurement has an error of 12.3%. What is the true mass (in kg) of the object?
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