A sample of krypton is initially at a pressure of 62.1 atm and a temperature of 121.9 K. The pressure on the sample is reduced to 0.720 atm at a constant temperature of 121.9 K. Which of the following are true? a. One or more phase changes will occur
b. The sample is initially a solid
c. The final state of the substance is a liquid
d. The liquid initially present will vaporize
e. The sample is initially a gas