What mass of sodium hydroxide will be required to neutralize completely 1.60 x 10²³ molecules of HCl?

Answer 1

NaOH + HCl ==> NaCl + H₂O .. balanced equation

How many moles of HCl do we have?

moles HCl = 1.60x10²³ molecules HCl x 1 mol / 6.022x10²³ molecules = 0.2657 moles HCl

How many moles of NaOH are required?

0.2657 mols HCl x 1 mol NaOH / mol HCl = 0.2657 moles NaOH required

What mass of NaOH is required?

molar mass NaOH = 40.0 g / mol

0.2657 mols NaOH x 40.0 g / mol = 10.6 g NaOH required (3 sig. figs.)