A 255 ML Round- Bottom Flask Is Weighed and Found

question 18

Multiple Choice

A 255 mL round- bottom flask is weighed and found to have a mass of 114.85 g A few milliliters of an easily vaporized liquid are added to the flask and the flask is immersed in a boiling water bath. All of the liquid vaporizes at the boiling temperature of water, filling the flask with vapor. When all of the liquid has vaporized, the flask is removed from the bath, cooled, dried, and reweighed. The new mass of the flask and the condensed vapor is 115.23g Which of the following compounds could the liquid be? (Assume the ambient pressure is 1 atm.)

• A) C₂H₅OH
• B) C₄H₉OH
• C) C₃H₇OH
• D) C₄H₁₀
• E) C₂H₆

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Definitions:

Menstrual Cycle

The regular natural change that occurs in the female reproductive system, making pregnancy possible.

Ovulation

The phase of a female's menstrual cycle in which an egg is released from the ovary, making it available for fertilization.

Proliferative Phase

A stage in the menstrual cycle following menstruation where the lining of the uterus (endometrium) thickens in preparation for a possible pregnancy.

Endometrial Cycle

The series of changes the endometrium (lining of the uterus) goes through during a menstrual cycle, preparing for potential pregnancy.