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 temperature 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 the temperature of 111.15 K on the temperature axis of the phase - diagram. Then, find the pressure value at the boundary between the solid and liquid phases at this temperature. Assume from the phase - diagram reading, the pressure is 7 atm.

Answer:

7 atm