Final answer:
The triple point of ammonia occurs at -77.73 degrees Celsius and 6.08 atmospheres. At this point, solid, liquid, and vapor ammonia coexist in equilibrium.
Step-by-step explanation:
The triple point is the temperature and pressure at which a substance exists in equilibrium as a solid, liquid, and vapor. For ammonia, the triple point occurs at a temperature of -77.73 degrees Celsius and a pressure of 6.08 atmospheres.
At this point, molecular motion is balanced, allowing all three phases to coexist. The triple point is a unique point on the phase diagram where the solid/liquid, liquid/gas, and solid/gas lines intersect. It represents the only combination of temperature and pressure at which all three phases can exist simultaneously.
Ammonia, with its formula NH3, is a compound made up of one atom of nitrogen and three atoms of hydrogen bonded together. The nitrogen atom has a lone pair of electrons, which affects the geometry and properties of the molecule.