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18 Nov 2019

How many mL of ethanol are contained in a 90.-mL portion of a mouthwash that has

7.4% (v/v)

of ethanol?

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Beverley Smith
Beverley SmithLv2
15 May 2019
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Related questions

A Chemistry major obtains a high-paying summer job in an analytical laboratory and is given the task of determining the ethanol content (in vol %) of a commercial mouthwash sample. He/she decides to do this by gas chromatography because the experiment was so enjoyable in Chem 209. Accordingly, the student takes exactly 2.0 mL of the mouthwash sample and dilutes this to 25.0 mL with deionized water. He/she then injects 2.0 ?L of the diluted sample into the GC and obtains a chromatogram containing two peaks. The first peak, which corresponds to ethanol, has a retention time of 75 seconds and an area of 216 while the second peak, which corresponds to water, has a retention time of 117 seconds and an area of 1212.The student then makes up several standard ethanol solutions ranging from 0 to 30% ethanol (vol %), injects 2.0 ?L of each into the GC, and uses the areas of the ethanol peak to create a calibration curve whose linear regression equation is:y = 144.2 xCalculate the ethanol concentration (vol %) of the mouthwash sample. SHOW ALL WORK.

Fermentatation and Distillation of Ethanol

1. a. Calculate the volume of ethanol contained in the distillate.

b. What is the overall volume of ethanol in the 100 mL sidearm flask?

c. A 2-lb bag of sugar costs about $2.99. Based on the volume of ethanol per 50 grams of sucrose obtained in the experiment, how much will it cost to produce the necessary volume of ethanol needed to manufacture twelve 750-mL bottles of wine with 11% v/v ethanol content?

Data:

1. Volume of distillate = 5.25 mL

2. % ethanol in the distillate via GC = 6.00%

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