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 12.232 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 of10.1 L of hydrogen gas was collected at a pressure of 739 torr anda temperature of 27.0Â°C. Additionally, 2.797 g of unreacted copperis recovered. Calculate the mass of hydrogen gas formed from thereaction. mass: g Calculate the mass of aluminum in the alloysample. mass: g What is the mass percent composition of the alloy?Cu : % Zn : % Al : %

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4.2 Ratings (830 Votes)

AnswerGiventotal wt of alloy sample 12232 gvolume of hydrogen H2 gas V 101 Ltemperature of hydrogen H2 gas T 270 0C 273 27 300Kpressure of hydrogen H2 gas P 739 torrwtof hydrogen H2 gas w wt of unreacted copper Cu 2797 gAs we know thatgas constant R 62364 LtorrK1mol1Since we know thatmolar mass of hydrogen H2 gas 2 molar mass of Hmolar mass of hydrogen H2 gas 2 1molar mass of hydrogen H2 gas 2 g molSo according to the formulaPV nRTorPV wRTMthereforepressure of hydrogen H2 gas P volume of hydrogen H2 gas V wtof hydrogen See Answer

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