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A 42.0 mg sample of aluminum reacts with an excess of 6 M HCl. A 42.6 mL volume of hydrogen gas is collected over water at 20 degrees C. The pressure of the "wet" hydrogen gas is adjusted to atmospheric pressure, a pressure of 750 Torr. Calculate the percent by mass of aluminum in the sample. The vapor pressure of water at 20 degree C is 17.5 Torr.

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Category:- Chemistry
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