Question

Cuantos moles de H2 se producen al reaccionar 11.5 g de Na con un exceso de H2O. Na2 + H2O => NaOH + H2

Answer 1

2Na + 2H2O => 2NaOH + H2

Mm Na = 23 g/mol

H2 = 2 g/mol

n H2 = 11.5 g Na x 1 mol Na x 1 mol H2 x 2 g H2

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23 g Na 2 mol Na 1 mol H2

n H2 = 0.5 moles