Equation is as follow,
4 Na (s) + O₂ (g) → 2Na₂O (s)
According to equation,
91.92 g (4 moles) of Na produces = 123.92 g (2 moles) of Na₂O
So,
17.4 g of Na will produce = X g of Na₂O
Solving for X,
X = (17.4 g × 123.92 g) ÷ 91.92 g
X = 23.45 g of Na₂O