Question

Question #84631

Answer 1

`"80. g"`

Explanation:

Since sodium hydroxide is a strong base and hydrochloric acid is a strong acid, they both completely dissociate when dissolved in water.

In a strong acid-strong base reaction, the moles of hydrogen ions must equal the moles of hydroxide ions in order to create a neutral solution.

`"HCl" + "NaOH" -> "NaCl" + "H"_2"O"`

Divide the `"73 g"` of `"HCl"` by its molar mass of `"36.46 g/mol"` to convert that value to moles

`"73 g"/"36.46 g/mol" = "2.002 moles"`

Then, using the fact that the moles of hydrochloric acid equal the moles of sodium hydroxide, we know that there are `2.002` moles of `"NaOH"`.

We would multiply that `2.002` by the molar mass of `"NaOH"` of `"39.997 g/mol"` to get

`"2.002 moles" * "39.997 g/mol" = "80. g NaOH"`