Thyroxine, an Important Hormone That Controls the Rate of Metabolism $\circ$

question 119

Multiple Choice

Thyroxine, an important hormone that controls the rate of metabolism in the body, can be isolated from the thyroid gland. If 0.455 g of thyroxine is dissolved in 10.0 g of benzene, the freezing point of the solution is 5.144 ^$\circ$ C. Pure benzene freezes at 5.444 ^$\circ$ C and has a K_f of 5.12 ^$\circ$ C/m. What is the molar mass of thyroxine

• A) 777 g/mol
• B) 787 g/mol
• C) 797 g/mol
• D) 807 g/mol
• E) None of the above

---

Definitions:

Cognition

The intellectual act of obtaining awareness and insight through the means of experience, contemplation, and sensory input.

Intelligence

The capacity for learning, understanding, problem-solving, and adapting to new situations, often measured through various cognitive tests.

Thinking

The mental process involved in reasoning, problem-solving, and the creation of ideas.

Reliable

The consistency of a measure or instrument, indicating the same results are achieved under consistent conditions.