Ideal Gas Law
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2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)
The hydrogen gas generated is collected over water at 19.0°C. The volume of the gas is 341 mL measured at 0.975 atm. Calculate the number of grams of sodium used in the reaction. (The vapor pressure of water at 19.0°C = 0.0217 atm.)