QUESTION IMAGE
Question
solid sodium oxide and gaseous water are formed by the decomposition of solid sodium hydroxide (naoh). write a balanced chemical equation for this reaction.
Step1: Write the unbalanced equation
The reactant is \(NaOH\) (solid), and the products are \(Na_2O\) (solid) and \(H_2O\) (gaseous). So the un - balanced equation is \(NaOH(s)
ightarrow Na_2O(s)+H_2O(g)\)
Step2: Balance the sodium atoms
On the left - hand side (LHS), there is 1 \(Na\) atom in \(NaOH\), and on the right - hand side (RHS), there are 2 \(Na\) atoms in \(Na_2O\). So we put a coefficient of 2 in front of \(NaOH\). The equation becomes \(2NaOH(s)
ightarrow Na_2O(s)+H_2O(g)\)
Step3: Balance the hydrogen and oxygen atoms
Now, for the LHS: In \(2NaOH\), the number of \(H\) atoms is 2 (\(2\times1\) from \(NaOH\)) and the number of \(O\) atoms is \(2 + 2=4\) (\(2\) from \(Na - O\) and \(2\) from \(O - H\)). On the RHS: In \(Na_2O\) there is 1 \(O\) atom and in \(H_2O\) there are 2 \(H\) atoms and 1 \(O\) atom. The total \(H\) atoms on RHS is 2 (from \(H_2O\)) and total \(O\) atoms on RHS is \(1 + 1=2\). The equation \(2NaOH(s)
ightarrow Na_2O(s)+H_2O(g)\) is balanced for \(Na\) (\(2\) on both sides), \(H\) (\(2\) on both sides) and \(O\) (\(2\) on both sides)
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\(2NaOH(s)
ightarrow Na_2O(s)+H_2O(g)\)