Answer : The mass of
needed is, 12.7 grams.
Explanation :
First we have to calculate the moles of HCl.


Now we have to calculate the moles of

The balanced neutralization reaction will be:

From the balanced chemical reaction we conclude that,
As, 1 mole of HCl neutralizes by 1 mole of

So, 0.151 mole of HCl neutralizes by 0.151 mole of

Now we have to calculate the mass of


Molar mass of
= 84 g/mole

Therefore, the mass of
needed is, 12.7 grams.