Below Is a Diagram Representing a Solvent A(l) in a 1-L

question 149

Multiple Choice

Below is a diagram representing a solvent A(l) in a 1-L beaker, and a solute X dissolved in the solvent. Solvent A has a density of 0.8 g/mL, and a molar mass of 40 g/mol. Solute X has a molar mass of 30 g/mol. Each circle of X represents 1 mol of X. Assume that the solute addition does not significantly change the volume of liquid in the beaker. What is the mole fraction of the solute X in this solution?

• A) 0.67
• B) 0.53
• C) 0.27
• D) 0.21
• E) 0.04

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Definitions:

Neurocognitive Disorder

A class of disorders characterized by primary clinical deficits in cognitive functioning that significantly affect daily living.

Alzheimer's Disease

A progressive neurodegenerative disorder characterized by memory loss, cognitive decline, and eventual loss of ability to perform everyday activities.

Major Neurocognitive Disorder

A brain disorder characterized by a deteriorating course of deficits in neurocognitive functioning (e.g., memory, attention) that interferes significantly with independent living.

Alzheimer's Disease

A progressive neurodegenerative disorder that affects memory, thinking, and behavior, and is the most common cause of dementia.