Provide solution in this given format: Given, required, solution and answer.  1. Hydrogen gas is collected over water at 22.5 ℃. Find the pressure of the dry gas if the atmospheric pressure is 94.4 kPa. 2.  How many grams of Al2O3 are formed from 15.0 L of O2 at 97.3 kPa and 21 ℃?                       4Al + 3O2→ 2Al2O3

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