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Solid sodium reacts with liquid water to form hydrogen gas according to the equation
2 Na(s) + 2 H₂O(l) → 2 NaOH(aq) + H₂(g)
What is the pressure (in atm) of hydrogen gas in the 20.0 L headspace of a reactor vessel when 3.36 kg sodium is reacted with excess water at 50.0 °C?