Question

How many grams of Na2O are required to produce 1.60 x 102 grams of NaOH? Na2O + H2O ---> 2 NaOH

Answer 1

This is a typical stoichiometry question.To answer this question you want to get a relationship between `Na_2`O and NaOH.

So you can get a relationship between the moles of `Na_2`O
and moles of NaOH by the concept of stoichiometry.

`Na_2`O + `H_2`O ----------------> 2 NaOH.

According to above balanced equation we can have the stoichiometry relationship between `Na_2`O and NaOH. as 1:2

It means 1 moles of `Na_2`O is required to react with one mol of `H_2`O to produce 2 moles of NaOH.

in terms of mass 1 mole of `Na_2`O has mass 62 g on reaction with water produces 2 moles of NaOH or 80 g of NaOH.

62 g of `Na_2`O produces 80 g of NaOH.

1g of NaOH is produced from 62/80 g of `Na_2`O

1.6 x `10^2` g of NaOH will require 62 x 1.6 x `10^2` g / 80 of `Na_2`O

124g of `Na_2`O.