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:

Canyon Feature

A deep gorge, usually with a river flowing through it, formed by long-term erosion from water activity.

Lava Flow

The movement of molten rock that emerges from a volcano or fissure onto the Earth's surface, where it solidifies as it cools.

Dike Unit

It is a geological structure consisting of a major vertical or steeply-dipping sheet-like body of intruded igneous rock that cuts through older rocks.

Half-Lives

The period of time it takes for a radioactive substance to decrease to half its original amount.