contestada

At what approximate temperature and pressure can all three phases of water exist simultaneously? 0°C, 760 mmHg 0°C, 5 mmHg 80°C, 380 mmHg 100°C, 760 mmHg

Respuesta :

AL2006
That's the "triple point" of water.
None of the choices describes it.

It's 4.58 mm Hg, 0.01 degree C .
carlos2112

Answer:

0°C, 5 mmHg

Explanation:

In order to understand this phenomenon, let's define the concept of triple point:

Triple point:

The triple point is a term in the field of thermodynamics that refers to the temperature and pressure in which there are simultaneously three phases of a substance in a state of thermodynamic equilibrium. This point exists for all substances, although the conditions in which they are achieved vary greatly between each one. In the case of water, the precise conditions of pressure and temperature at which it coexists in its three phases in equilibrium: Liquid, ice and vapor, occur at a temperature of exactly:

[tex]T=273.16 K=0.01 \°C\approx0\°C[/tex]

and a partial vapor pressure of:

[tex]P=611.656Pa=4.58779654339mmHg\approx5mmHg[/tex]