Question

4Na+O2 = 2Na2O

How many grams of sodium oxide is formed by burning 46g sodium in air?

Answer 1

The equation is as follows:
4Na + O₂ → 2Na₂O
Molar mass of sodium (Na) = 23 g/mol
Molar mass of Na₂O = 2$\times$23 + 16 = 62 g/mol
According to reaction ,
92 g of sodium is burnt in air to give = 124 g of Na₂O
46 g of sodium will give = $\frac{124\times 46}{92}$ = 62 g
Hence , 62 g of sodium oxide (Na₂O) is formed by the burning of 46 g of sodium in air.