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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 °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)

Answer & Explanation Solved by verified expert
4.4 Ratings (845 Votes)
Total mass of the sample 1147 gm unreacted copper 2169 gm Mass of aluminium and zinc 1147 21699301 gm let x mass of aluminium therefore mass of zinc 9301x Moles of aluminium massatomic weight x27 and    See Answer
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