Potassium metal reacts with water according to the following balanced equation. 2K(s)+2H2O(l)⟶2KOH(aq)+H2(g) How many moles of potassium are required to produce 18.0 moles of H2?

Answer 1

Use the balanced chemical reaction equation to answer your question:

2K(s) + 2H₂O(l) ⟶ 2KOH(aq) + H₂(g)

It says that 2 moles of potassium combine with 2 moles of water to make 2 moles of potassium hydroxide and 1 mole of hydrogen gas.

So to get 18 moles of hydrogen gas, you need 36 moles of potassium.