[halp]

If they ask molar heat of neutralisation, then i'll use moles of water

however, in this question it doesnt specify. It only says enthalpy of solution for this reaction. It doesn't specify which reactant or product to use for the calculations. In my other textbook questions, it usually specifies. So, for this question, is it water or HCl?

[DrCMS]

I guess the point of this question is to make you think about those things to work out the right answer.

[halp]

I chose to use moles of HCl because enthalpy of solution is apparently using moles of solute.
But if i used water, it would be because it's a neutralisation reaction, hence enthalpy of neutralisation.

However, I dont know if it is a neutralisation reaction or not.

The link below is the sample exercise that the question says to attempt.
https://www.dropbox.com/s/fcyi4u32z1ualnd/fdsfs.png?dl=0

[Borek]

Alright, so should i use the moles of the limiting reagent which is HCl or the moles of water produced in this question?

You have asked this question several times, apparently you are missing the most important thing here: can these be different?