Question

calculate the triple point temperature and pressure of water

Answer 1

The triple point of water is used to define the kelvin, the base unit of thermodynamic temperature in the International System of Units (SI).[2] The value of the triple point of water is fixed by definition, rather than measured. The triple points of several substances are used to define points in the ITS-90 international temperature scale, ranging from the triple point of hydrogen (13.8033 K) to the triple point of water (273.16 K, 0.01 °C, or 32.018 °F).

Answer 2

Heya
here's your answer....
At the triple point, all the phases (solid, liquid and vapor) exist in equilibrium.
Therefore, vapor pressure of liquid ammonia = vapor pressure of solid ammonia.
Triple point pressure can be obtained from any of the vapor pressure to temperature relation.
hope it helps..✌✌