Question

what state of matter is a sample at 2.2 atm and 41 °c?
pressure (atm)
0 50 100 150 200
temperature (°c)
solid
liquid
gas
gas
liquid
solid

Explanation:

Step1: Locate temperature on phase diagram

Find 41°C on the x-axis (temperature).

Step2: Locate pressure on phase diagram

Find 2.2 atm on the y-axis (pressure).

Step3: Identify state at intersection

The point (41°C, 2.2 atm) lies in the solid region.

Answer:

solid