Question

4 Na + O2 ---> 2 Na2O

For the reaction whose balanced equation is as follows, find the number of grams of sodium that must react to produce 42.0 grams of sodium oxide.

Answer 1

Molar mass of Na = 23 g/mol

Molar massa of Na2O = 62 g/mol

balanced chemical equation:

4 Na + 1 O2 ------> 2 Na2O

4 . 23 g Na --------------> 2 . 62 g Na2O
x -------------------------> 42,0 g Na2O

124 x = 3864


`x = (3864)/(124)`


`x = 31,16 g` of Na