How Much Hydrogen?

Question

Alkali metals react violently with water. How much Hydrogen gas (in g) is produced when 10.0 g of sodium reacts with excess water according to the following equation?

2Na + 2H₂O ----> 2NaOH + H₂

Answer 1

2Na(s) + 2H₂O(l) ==> 2NaOH(aq) + H₂(g) ... balanced equation

10.0 g Na x 1 mol Na / 23.0 g x 1 mol H₂ / 2 mol Na x 2 g H₂/ mol = 0.435 g H₂ gas