Question

Sodium reacts with oxygen to produce sodium oxide. 4Na(s)+O2(g)→2Na2O(s).How many grams of O2 are needed in a reaction that produces 75.8 g of Na2O?

Answer 1

We have the reaction that

In this reaction

1 mole of Oxygen can produce 2 mole of

We know that 1 mole of the molecule is equal to molecular mass of the molecule.

1 mole of oxygen = 32 gm of oxygen

1 mole of     is 62 gm of  

and 2 mole of   is 124 gm of  

We can write that

32 gm of oxygen gas produce 124 gm of  

It can be written in other way that

124 gm of   is produced from 32 gm

Then 75.8 gm of   will produced from

Hence for the production of 75.8 g of   , we need 19.55g of .