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General Chemistry - Quiz 1 1997

General Chemistry - Quiz 1 1997 - Dr Rashmi Venkateswaran...

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Page 1 of 8 September 29, 1997 Dr. Rashmi Venkateswaran CHM 1310 A GENERAL CHEMISTRY QUIZ 1 NAME STUDENT ID. No. DEMONSTRATOR’S NAME: LAB DAY: 1. An impure sample contains aluminum and an unreactive material. A sample having a mass of 5.00 g is analyzed by its reaction with hydrochloric acid according to the following equation. If 4.16 L of hydrogen are collected over water, what is the percentage of aluminum in the sample? The room temperature and pressure are 25.0 °C and 0.845 atm respectively and the vapour pressure of water at this temperature is 23.8 Torr. The value of R is 8.314 J mol -1 K -1 . Al (s) + HCl (aq) H 2 (g) + AlCl 3 (aq) (8)
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