Question

At what approximate temperature and pressure can all three phases of water exist simultaneously?

a. 0°C, 760 mmHg
b. 0°C, 5 mmHg
c. 80°C, 380 mmHg
d. 100°C, 760 mmHg

Answer 1

I'm Guessing A since it takes about 0.01°C temperature and around 600 pascals of pressure

Answer 2

b. 0°C, 5 mmHg

Step-by-step explanation:

This point of coexistence of the three phases of a substance is called the triple point. For the water is at 273.16K and 611.657 pascals. Convert the units with these formulas:

°C=K-273.1

mmHg=Pa*0.007501

°C=273.16-273.1=0.06≈0.0°C

mmHg=611.657*0.007501=4.59≈5mmHg