A Solution Is Made by Mixing 569 ML of Water

question 69

Multiple Choice

A solution is made by mixing 569 mL of water and 238 mL ethanol. What is the concentration of ethanol in units of volume/volume percent?

• A)41.8% (v/v)ethanol
• B)0.418% (v/v)ethanol
• C)29.5% (v/v)ethanol
• D)0.295% (v/v)ethanol
• E)70.5% (v/v)ethanol

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Definitions:

Melatonin Treatments

Therapeutic uses of melatonin, a hormone that regulates sleep-wake cycles, often used to treat sleep disorders.

Sleep-wake Cycles

The natural, circadian rhythm that regulates when we are awake and when we sleep, typically repeating every 24 hours.

Light Perception

The ability to see light and differentiate between its intensity and direction, a fundamental aspect of vision.

Circadian Rhythms

Biological processes that occur on a roughly 24-hour cycle, influencing sleep, wakefulness, and various bodily functions.