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0.352g of a mixture of aluminum and magnesium metal is reacted with HCl and the gas...

0.352g of a mixture of aluminum and magnesium metal is reacted with HCl and the gas produced collected over water at 21.5°C and 755.3mmHg. The vapor pressure of water at this temperature is 19.2 torr. If 412.5mL of gas is collected, what is the percent of magnesium in the mixture?

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