Zinc and sodium metal each react with sulfuric acid according to the following equations.

Zn(s)+H2SO4(aq)ZnSO4(aq)+H2(g)

A 26.13 g mixture of zinc and sodium is reacted with a stoichiometric amount of sulfuric acid. The reaction mixture is then reacted with 133 mL of 3.70 M barium chloride to produce the maximum possible amount of barium sulfate. Determine the percent sodium by mass in the original mixture.

mass percent Na: %

If 77.93 mL of sulfuric acid was added, what was the concentration of the sulfuric acid?

concentration: M