What Is the Mole Fraction of Urea,CO(NH₂)₂,in a Solution Prepared

question 49

Multiple Choice

What is the mole fraction of urea,CO(NH₂) ₂,in a solution prepared by dissolving 4.8 g of urea in 30.3 g of methanol,CH₃OH?

• A) 0.86
• B) 0.14
• C) 0.078
• D) 0.92
• E) 0.23

---

Definitions:

Operations

Internalized actions that allow children to do mentally what before they had done only physically. Operations also are reversible mental actions.

Habits

Regular patterns of behavior that are acquired through frequent repetition and often occur subconsciously.

Multi-tasking

The ability to perform more than one task or activity simultaneously, though often leading to a decrease in performance or quality in the tasks.

Encoding

The process by which information is transformed into a format that can be stored in memory.