Given:
57.5 grams of Na (Sodium) to form Na2O
First, set-up a balanced chemical equation:
Na + NaOH => Na2O + 1/2H2
To determine the number of grams Na2O produced with the given amount of sodium:
57.5 grams Na / 23g/mol Na * (1 mol Na2O/ 1 mol Na) * 62 g/mol Na2O
= 155 grams of Na2O