Question

the pressure above a pure sample of solid substance x at -162. °c is raised. at what pressure will the sample melt? use the phase diagram of x below to find your answer. note: your answer must be within 1.75 atm of the exact answer to be graded correct.

Explanation:

Step1: Convert Celsius to Kelvin

First, convert - 162°C to Kelvin. The conversion formula is $T(K)=T(^{\circ}C)+273.15$. So, $T = - 162+273.15=111.15$ K.

Step2: Read pressure from phase - diagram

Locate 111.15 K on the temperature axis of the phase - diagram. Then, find the pressure value at the solid - liquid phase boundary at this temperature. By visual inspection of the phase - diagram, we can estimate the pressure.

Answer:

(The answer depends on the actual reading from the phase - diagram. Since the diagram is not fully legible for precise value extraction, a specific numerical answer cannot be provided. But the process is as above.)