Question

72.0 grams of water how many miles of sodium with react with it?

Answer 1

Answer:

$\large \boxed{\text{8.00 mol}}$

Explanation:

We will need a balanced chemical equation with masses, moles, and molar masses.

1. Gather all the information in one place:

Mᵣ:                  18.02

            2Na + H₂O ⟶ 2NaOH + H₂

m/g:                72.0  

2. Moles of H₂O

$\text{Moles of H _{2} O} = \text{72.0 g H _{2} O} \times \dfrac{\text{1 mol H _{2} O}}{\text{18.02 g H _{2} O}} = \text{3.996 mol H _{2} O}$

3. Moles of Na

The molar ratio is 2 mol Na/1 mol H₂O.

$\text{Moles of Na} = \text{3.996 mol H _{2} O} \times \dfrac{\text{2 mol Na}}{\text{1 mol H _{2} O}} = \textbf{8.00 mol Na}\\\\\text{The water will react with \large \boxed{\textbf{ 8.00 mol}} of Na}$