Question

use the phase diagram of substance x below to find the boiling point of x when the pressure on the liquid is 0.44 atm. note: your answer must be within 12.5 °c of the exact answer to be graded correct.

Explanation:

Step1: Locate pressure on phase - diagram

Locate 0.44 atm on the pressure axis.

Step2: Find boiling - point temperature

Draw a horizontal line at 0.44 atm until it intersects the liquid - gas phase boundary. Then draw a vertical line down to the temperature axis to read the temperature in Kelvin. Assume the temperature in Kelvin is $T_{K}$.

Step3: Convert Kelvin to Celsius

Use the conversion formula $T_{C}=T_{K}- 273.15$.

Let's assume from the phase - diagram, the temperature at 0.44 atm on the liquid - gas boundary is $T_{K} = 150$ K (this is an example value based on general phase - diagram reading, actual value should be read from the given diagram accurately).
$T_{C}=150 - 273.15=- 123.15^{\circ}C$

Answer:

(Actual value should be obtained by accurately reading the phase - diagram, here we just show the process. After reading the diagram accurately and doing the conversion, fill in the correct Celsius value)