Question

 Balance the equation below, then answer the following question: How many moles of hydrogen gas will form if 0.35 moles of Na reacts with an excess of water?

Answer 1

 2H₂0 +2Na->> 2NaOH + H₂

From the given equation

1 moles of H₂ = 2molesof Na

Therefore

0.35 moles of Na = 0.35 ÷ 2

= 0.175 moles of hydrogen gas