A materials scientist has created an alloy containing aluminum, copper, and zinc, and wants to determine...

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Chemistry

A materials scientist has created an alloy containing aluminum,copper, and zinc, and wants to determine the percent composition ofthe alloy. The scientist takes a 11.470 g sample of the alloy andreacts it with concentrated HCl. The reaction converts all of thealuminum and zinc in the alloy to aluminum chloride and zincchloride in addition to producing hydrogen gas. The copper does notreact with the HCl. Upon completion of the reaction, a total of9.77 L of hydrogen gas was collected at a pressure of 724 torr anda temperature of 27.0 Â°C. Additionally, 2.169 g of unreacted copperis recovered. Calculate the mass of hydrogen gas formed from thereaction.

- Calculate the mass of aluminum in the alloy sample

- what is the mass percent composition of the alloy (percentage ofthe Cu, Al and Zn)

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4.0 Ratings (611 Votes)

PV nRT n H2724torr760torr x1atm x 977L0082LatmmolKx300K 0378341891 mol mass H2 mol x MW 0378341891 mol x 2gmol 0757g of H2 mass sample mass Al mass Zn See Answer

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