Question

A materials scientist has created an alloy containing aluminum, copper, and zinc, and wants to determine the percent composition of the alloy. The scientist takes a 12.502 g sample of the alloy and reacts it with concentrated HCI. The reaction converts all of the aluminum and zinc in the alloy to aluminum chloride and zinc chloride in addition to producing hydrogen gas. The copper does not react with the HCI. Upon completion of the reaction, a total of 9.78 L of hydrogen gas was collected at a pressure of 736 torr and a temperature of 27.0 °C. Additionally, 2.937 g of unreacted copper is recovered. Calculate the mass of hydrogen gas formed from the reaction. Number Calculate the mass of aluminum in the alloy sample. Number What is the mass percent composition of the alloy? Number Number Number %Zn %Al % Cu

Answer 1

9. 565 2 760 RT a 0- 385 me 64 65 65

9.565-거 "Х 18 . 385 65 X- 5 -92 mars 从2 5.92. 9-565 - 5.92. 3- 64.5 0 12- 502 47-35%. X 160% L2 502 n 3.645 12-502 mans 5.92