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:

c)

73 atm and 31.1 °C
Please i need (d)

a)5.11 atm and -56.3

c) 73 atm and 31.1
d) 1 atm -78.5

Any ideas for b) ?

b - i

thanks

To answer these questions using the given unary phase diagram of carbon dioxide (CO2), you need to understand the different regions and points on the diagram. Here's how you can find the answers step-by-step:

(a) Triple Point:
The triple point is the point where all three phases of a substance (solid, liquid, and gas) coexist in thermodynamic equilibrium. On the phase diagram, it is usually represented by a specific point. To find the pressure and temperature values of the triple point of dry ice (CO2):

1. Locate the point where the solid, liquid, and gas phases meet. This is the triple point.
2. Read the values on the axes that correspond to this point.

The pressure and temperature values will vary depending on the specific diagram you are looking at. Check the labels or legend on the diagram to find the units used. If the units are not provided, assume they are in atm and Celsius.

(b) Density of Solid CO2 vs. Liquid CO2:
To determine whether solid CO2 (dry ice) is more or less dense than liquid CO2 at the same temperature, you need to understand the slope of the phase boundaries on the diagram.

1. Locate the boundary between the solid and liquid phases.
2. Observe the slope of the boundary line:
- If the line slopes upward from left to right (i.e., from lower temperature to higher temperature), then solid CO2 is denser than liquid CO2 at the same temperature. (i) is the answer.
- If the line slopes downward from left to right, then liquid CO2 is denser than solid CO2 at the same temperature. (ii) is the answer.

(c) Critical Point:
The critical point is the highest temperature and pressure at which a substance can exist as a homogeneous fluid. To find the pressure and temperature values of the critical point of dry ice (CO2):

1. Locate the point where the gas-liquid boundary ends (upper boundary).
2. Read the values on the axes that correspond to this point.

Again, the values will depend on the specific diagram, and you may need to consult the labels or legend.

(d) Phase Transformations at Ambient Pressure:
Under ambient pressure conditions (typically around 1 atm), phase transformations occur at specific temperatures. To find these values on the phase diagram:

1. Locate the pressure axis at approximately 1 atm.
2. Trace a horizontal line from this pressure value until it intersects the phase boundary lines.
3. Read the temperatures at which the intersections occur.

Again, the exact values will depend on the specific diagram.

Remember, the accuracy of the answers will depend on the quality and details of the phase diagram provided. If you have access to a specific unary phase diagram for carbon dioxide (CO2), consult that diagram to obtain precise answers to the questions.