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Sodium reacts with water to produce sodium hydroxide and hydrogen gas according to the following equation

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Sodium reacts with water to produce sodium hydroxide and hydrogen gas according to the following equation.  2 Na(s) + 2 H₂O(l) --------- 2 NaOH(aq) + H₂(g)

How many grams of sodium are needed to produce 475 mL of hydrogen at 55.0 °C and 0.985 atm, if the hydrogen is collected over water? The vapor pressure of water at this temperature is 118 mm Hg.