IF you had 11 grams of sodium, based on 4Na+O2=>2NA2O, how many grams of Na2O would be able to be produced?

Answer 1

Use dimensional analysis:

11 g Na x 1 mol Na/23 g Na x 2 mol Na₂O/4 mol Na x 62 g Na₂O/mol Na₂O = 14.8 g Na2O = 15 g Na₂O

Answer 2

11g Na* (1mol Na)/(23g Na) *(2 mol Na_2 O)/(4 mol Na) * (62 g Na_2 O)/(1mol Na_2 O)=14.82 g Na_2 O

molecule weights are taken from the periodic table.

Start with grams of Na then convert to moles then multiply by the mole to mole ration of Na to Na2O and then convert moles of Na2O to grams.