The Term Proof Is Defined as Twice the Percent by Volume

question 20

Multiple Choice

The term proof is defined as twice the percent by volume of pure ethanol in solution. Thus, a solution that is 95% (by volume) ethanol is 190 proof. What is the molarity of ethanol in a 92 proof ethanol/water solution?

• A) 0.46 M
• B) 0.80 M
• C) 17 M
• D) 0.92 M
• E) 8.0 M

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Definitions:

Muscle Tone

The continuous and passive partial contraction of the muscles, which helps maintain posture.

Comparator

In general terms, a device or system that compares two items or signals and determines their relationship or difference.

Intended Movements

Movements that are planned or decided upon before they are executed, involving cognitive processes.

Sensory Stimuli

External or internal factors that can elicit a response from sensory organs, leading to a sensation.