Question

At STP, which of these substances is most soluble in H20?

1)NH3
2)KCl
3)HCl
4)NaNO3

Answer 1

Its either 1 or 3,

NH3 is polar like HCl, which has hydrogen bonding...

Answer 2

2)KCl

Step-by-step explanation:

Alkali metal chlorides are extremely soluble in water at STP. Of all the compounds listed, KCl is an alkali metal chloride known for their very high solubility in water. Hence the answer.

The other substances listed in the options are soluble in water but KCl is the single best answer to the question.