Question

Shown below is a rough sketch of the unary phase diagram (pressure vs. temperature) for carbon dioxide , dry ice. Note the diagram is not drawn to scale and contains breaks in the axes to signify this. Using the diagram, answer the following questions:

(a) Give the pressure (in atm) and temperature (in Celsius ) values for the triple point of dry ice.

Pressure:
Temperature:

(b) Is solid CO2 more or less dense than liquid CO2 at the same temperature?

i)Solid is denser than liquid.
ii)Liquid is denser than solid.

(c) Give the pressure (in atm) and temperature (in Celsius ) values for the critical point of dry ice.

Pressure:
Temperature:

(d) Give the pressure (in atm) and temperature (in Celsius ) values of the phase transformations observed under ambient pressure conditions.

Pressure:
Temperature:

Answer 1

c)
73 atm and 31.1 °C
Please i need (d)

Answer 2

a)5.11 atm and -56.3
c) 73 atm and 31.1
d) 1 atm -78.5

Answer 3

Any ideas for b) ?

Answer 4

b - i

Answer 5

thanks