A) The substance sulfur dioxide has the following properties: normal melting point: 200.4 K normal boiling point: 263.1 K triple point: 1.7Ã—10-3...

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Chemistry

A) The substance sulfur dioxide has thefollowing properties:
normal melting point: 200.4 K
normal boiling point: 263.1 K
triple point: 1.7Ã—10^-3 atm,197.6 K
critical point: 78 atm, 430.7 K

A sample of sulfur dioxide at a pressure of 1.00atm and a temperature of 253.5 K is cooled atconstant pressure to a temperature of 192.3 K.Which of the following are true?

Choose all that apply
The solid initially present will vaporize.
The sample is initially a liquid.
The final state of the substance is asolid.
One or more phase changes will occur.
The final state of the substance is aliquid.
B) The substance xenon has the followingproperties:
normal melting point: 161.3 K
normal boiling point: 165.0 K
triple point: 0.37 atm, 152.0 K
critical point: 57.6 atm, 289.7 K

A sample of xenon is initially at a pressure of63.9 atm and a temperature of178.0 K. The pressure on the sample is reduced to0.370 atm at a constant temperature of178.0 K. Which of the following are true?

Choose all that apply
The sample is initially a liquid.
The liquid initially present will solidify.
One or more phase changes will occur.
The final state of the substance is asolid.
The final state of the substance is a gas.

Answer & Explanation Solved by verified expert

4.5 Ratings (936 Votes)

A Note that a sample that lies below normal melting point at 100 atm must be a solid while a sample that lies in between melting point and boiling point is a gas and a sample that lies above boiling point is a gas The sample is initially at 100 atm and 2535 K Since the normal melting point of SO2 is given to be 2004 K solidliquid boundary and normal boiling point is 2631 Kliquidgas boundary it must exist as a liquid at 2535 K Further the temperature is being dropped to 1923 K which is lower than the melting point of 2004 K Hence the final state of the compound is a solid Hence the liquid is condensing to form a solid as the temperature changes from 2535 K See Answer

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normal melting point:	200.4 K
normal boiling point:	263.1 K
triple point:	1.7Ã—10^-3 atm,197.6 K
critical point:	78 atm, 430.7 K

normal melting point:	161.3 K
normal boiling point:	165.0 K
triple point:	0.37 atm, 152.0 K
critical point:	57.6 atm, 289.7 K