so3+na2o=

The reaction between sulfur trioxide (SO₃) and sodium oxide (Na₂O) typically produces sodium sulfate (Na₂SO₄).

The balanced chemical equation for this reaction is:

\[ \text{SO}_3 + \text{Na}_2\text{O} \rightarrow \text{Na}_2\text{SO}_4 \]

This shows that one mole of sulfur trioxide reacts with one mole of sodium oxide to produce one mole of sodium sulfate.