Easy
Balance the equation: __Na + __H2O → __NaOH + __H2
Explanation
Explanation
Balancing sodium, oxygen, and hydrogen atoms on both sides requires 2 sodium atoms and 2 water molecules to produce 2 NaOH and 1 H2, giving 2Na + 2H2O → 2NaOH + H2.
PRO TIP
Re-check your working by substituting the answer back into the original question.