Barium Is a Nonessential Element in the Human Body, but Some

question 12

Multiple Choice

Barium is a nonessential element in the human body, but some organisms build exoskeletons using barium sulfate, which has a K_sp of 1.1 * 10^-10 at 25°C. What is the mass of barium in 1.0 L of a saturated solution of barium sulfate at 25°C?

• A) 4.1 \(\mu\)g
• B) 1.4 mg
• C) 3.7 mg
• D) 7.3 \(\mu\)g
• E) 15 ng

---

Definitions:

Balancing Career

The process of managing professional responsibilities and goals while maintaining a healthy personal life.

Old Boys' Club

An informal system where the social connections among men, often from similar socio-economic and educational backgrounds, are used to gain professional advantages.

Informal Communication

The exchange of information and ideas in a casual, unstructured format, often within social networks or relationships rather than through official channels.

Paternity Leave

A period of absence from work granted to a father after or just before the birth of his child, allowing him to spend time with his newborn or newly adopted child.