10 1 mark acetylene has a critical point at 36 c and

10. (1 mark) Acetylene has a critical point at 36 ° C and 60 atm, and the solid-liquid coexistence
curve has a positive slope. Which of the following statements regarding acetylene is false?
A. It is possible for acetylene to exist as a gas at temperatures higher than 36 °
B. The melting point of acetylene will decrease as pressure increases.*
C. Solid acetylene is more dense than liquid acetylene.
D. The sublimation of acetylene is an endothermic process.
E. The fusion of acetylene is an endothermic process.
C.
The following phase diagram is constructed from the information provided in the question.

CHEM 123 (Winter 2015) Test #1 (Version 001) Solutions Page 8 of 14
11. (1 mark) Rank the following compounds in order of increasing boiling point (from lowest to
highest boiling point).
ethanol (CH
3
CH
2
OH) dimethyl ether (CH
3
OCH
3
ethylene glycol (HOCH
2
CH
2
OH) ethane (CH
3
CH
3
A. ethane < dimethyl ether < ethanol < ethylene glycol*
B. ethane < ethanol < dimethyl ether < ethylene glycol
C. dimethyl ether < ethane < ethylene glycol < ethanol
D. ethanol < ethane < ethylene glycol < dimethyl ether
E. ethane < dimethyl ether < ethylene glycol < ethanol
)
)