Question

How many moles of hydrogen gas are produced when 0.066 mole of sodium is completely reacted?

Answer 1

Answer : The number of moles of hydrogen gas is, 0.033 mole

Explanation : Given,

Moles of sodium = 0.066 mole

The balanced chemical reaction will be,

$2Na(s)+2H_2O(l)\rightarrow 2NaOH(aq)+H_2(g)$

From the balanced chemical reaction, we conclude that 2 moles of sodium  react with 2 moles of water to give 2 moles of sodium hydroxide and 1 mole of hydrogen has as a product.

As, 2 moles of sodium react to give 1 mole of hydrogen gas

So, 0.066 mole of sodium react to give $\frac{1}{2}\times 0.066=0.033$ moles of hydrogen gas

Therefore, the number of moles of hydrogen gas is, 0.033 mole

Answer 2

Base on my research the complete reaction of hydrogen and sodium are form by this equation  2Na + 2H2O = 2NaOH +H2 If we base from this equation it shows you already the ratio of the moles of the product and reactants taking part in the reaction

1 mole of Na r/w 1 mole of water to produce .5 mole of Hydrogen 

Therefore, .066 mole of Na produces .033 moles of H2