Question

Na2O + H2O à 2 NaOHHow many moles of Na2O are required to react to produce 1.57 moles of NaOH?

Answer 1

Since the reaction is

`Na_2O+H_2O\to2NaOH`

We would first need to balance it, but we can see that it was already balanced.

So, we can just apply the stoichiometry.

Assuming all the Na₂O react, we can just compair the coefficients of Na₂O and NaOH to calculate how much we need.

From the equation, we see that each 1 mol of Na₂O produce 2 moles of NaOH, so using rule of three we have:

Na₂O --- NaOH

x --- 1.57 mol

1 mol --- 2 mol

So we have the relation:

`\begin{gathered} (x)/(1mol)=(1.57)/(2) \\ x=0.785mol \end{gathered}`

So, we need 0.785 mol of Na₂O.