Question

How many moles of water are needed to react completely with 12 moles of sodium according to the balanced equation that follows?

2Na + 2H₂0 → 2NaOH + H₂

Answer 1

balanced equation:

2 Na + 2 H₂O = 2 NaOH + H₂

mole ratio :

2 moles Na ----------- 2 moles H₂O
12 moles Na --------- ? moles H₂O

moles H₂O = 12 x 2 / 2

moles H₂O = 24 / 2

= 12 moles of H₂O

hope this helps!