Final answer:
H₂O (water) is a stronger acid than NH₃ (ammonia) due to the higher electronegativity of oxygen compared to nitrogen. Water has the ability to donate protons more readily than ammonia and exhibits different physical states such as liquid, ice, and steam.
Step-by-step explanation:
The compounds H₂O (water) and NH₃ (ammonia) are both binary hydrogen compounds that exhibit acidic behavior in water. However, ammonia, NH₃, is a weaker acid than is water, H₂O, which in turn is weaker than hydrogen fluoride (HF). This is due to the differences in electronegativity between the nonmetal atoms in these molecules and how effectively they can stabilize the negative charge on their respective conjugate base. For instance, H₂O has a stronger tendency to donate a proton (H+) compared to NH₃, making water a stronger acid than ammonia. Additionally, water exists in different forms such as liquid, ice, and steam, with its physical state depending on the temperature and pressure conditions.