The substance hydrogen has the following properties: normal melting point: 14.0 K normal boiling point: 20.3 K 7.1×10² atm, 13.9 K triple point: critical point: 12.8 atm, 33.2 K A sample of hydrogen at a pressure of 1.00 atm and a temperature of 64.4 K is cooled at constant pressure to a temperature of 5.9 K. Which of the following are true? Choose all that apply O One or more phase changes will occur. U The final state of the substance is a solid. O The liquid initially present will vaporize. O The final state of the substance is a liquid. O The sample is initially a gas.

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A: Mm