An Unknown Nonelectrolyte and Nonvolatile Compound Is Dissolved in Enough

question 73

Multiple Choice

An unknown nonelectrolyte and nonvolatile compound is dissolved in enough pure water to make 229 mL of solution. The vapour pressure above the solution drops from 233.7 Torr to 229.1 Torr when 82.3 g of the compound is dissolved at constant temperature. Determine the molar mass of the unknown compound. Assume no change in volume occurs upon dissolution.

• A) 323 g mol^-1
• B) 480 g mol^-1
• C) 414 g mol^-1
• D) 459 g mol^-1
• E) 508 g mol^-1

---

Definitions:

Motor Functions

The physiological processes that involve the coordination and execution of muscle movements.

Cerebral Hemisphere

Each of the two parts of the cerebrum (the largest part of the brain) in the brain of a vertebrate, separated by the fissure.

Corpus Callosum

The broad ribbon of nerve fibers that links the two hemispheres of the brain and facilitates communication between them.

Neurons

Neurons are the basic working units of the brain, specialized cells that transmit information to other nerve cells, muscle, or gland cells.