What is the theoretical number of moles of hydrogen gas should be produced when 0.068 mol of sodium metal reacts?

Sodium Metal when reacted with water produces Hydrogen gas and NaOH,

                     2 Na (s) + 2 H₂O (l)    →    2 NaOH (aq)  +  H₂ (g)

According to equation,

                     2 moles of Na produces  =  1 mole of H₂ gas
So,
          0.068 moles of Na will produce  =  X moles of H₂ gas

Solving for X,
                        X  =  (0.068 mol × 1 mol) ÷ 2 mol

                        X  =  0.034 moles of H₂

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