# Ochem

A student needed to determine the percent composition of a mixture that contained fluorene and benzoic acid. The student took 283 mg of the mixture and used the extraction method to separate the components. Then both compounds were recrystallized and dried. The experiment produced 141 mg of fluorene and 105 mg of benzoic acid. Calculate the percent composition of the mixture.

Fluorene = _____%
Benzoic acid = ______%

In order to find the percent composition of fluorene, would I just divide 105 by 283 and then multiply by 100 to get the answer?

Any help would be appreciated! :D

1. 👍 0
2. 👎 0
3. 👁 1,036
1. That should give you the percent fluorene and a similar process will calculate percent benzoic acid; however, note that 105 + 141 is not = to 283 mg. Something must be missing from the problem.
1. The sample contained something other than fluorene and benzoic acid, or
2. We assume the extra material was lost during the extraction, either in the aqueous phase or the organic phase (or both) in which case the percent calculated is too low for either/both materials.

1. 👍 0
2. 👎 0

## Similar Questions

1. ### Chemistry

A student found that her mixture was 15 percent NH4cl 20 percent NaCl and 75 percent Sio2 Assuming her calculations are correct what did she most likely do incorrectly in her experiment?

2. ### Chemistry - Quantitative analysis

A mixture weighing 7.290 mg contained only cyclohexane, C6H12 (FM 84.159), and oxirane, C2H4O (FM 44.053). When the mixture was analyzed by combustion analysis, 21.999 mg of CO2 (FM 44.010) were produced. Find the weight percent

3. ### organic chemistry

Determine the percent composition of your unknown mixture. My data for refractive indexes for acetone is 1.365 and water is 1.330. This is what my unknown mixture was composed of. How do I use this info to find percent composition

4. ### Organic Chemistry

Separation scheme for isolating benzoic acid Could you please show me a separation scheme for isolating benzoic acid from a reaction mixture if mixing a Grignard reagent phenylmagnesium bromide with dry ice (CO2) in ether? Thanks!

1. ### Ap Chemistry

a mixture contains only sodium chloride and potassium chloride. a .1586-g sample of the mixture was dissolved in water. it took 22.90 mL of 0.1000 M AgNO3 to completely precipitate all the chloride present. what is the

2. ### chemistry

Consider an isomeric mixture of alkenes of molar mass M=70g/mol. Determine the molecular formula of the alkenes. Hyrogenation of the isomeric mixture produces alkanes. What is the name of the alkane. If the alkenes in the original

3. ### Chemistry

A mixture contains only CuCl2 and FeCl3. A 0.7391 g sample of the mixture is completely dissolved in water and treated with silver nitrate. if 86.91 mL of 0.1463 M silver nitrate soultion is needed to precipitate all the chloride

4. ### Organic Chemistry Lab

For this week's lab, we have to devise our own separation and purification scheme. The mixture contains three compounds, however my problem lies in the fact that the composition isn't given to us. There are four possible

1. ### organic chemistry

urgent, please help me...this is about the separation and purification scheme... there is 4 group of mixture: a)benzoic acid, benzoin and 1,4-dibromobenzene b)fluorene, o-toluic acid and 1,4-dibromobenzene c)phenanthrene, methyl

2. ### Chemistry

A student is given 2.94g of a mixture containing anhydrous MgCl2 and KNO3. To determine the percentage by mass of MgCl2 in the mixture, the student uses excess AgNO3 to precipitate the chlorides ios as AgCl Starting with the 2.94g

3. ### Organic Chem

A student prepares ethyl benzoate by the reaction of benzoic acid with ethanol using a sulfuric acid catalyst. The following compounds are found in the crude reaction mixture: ethyl benzoate (major component), benzoic acid,

4. ### Chemistry

An unknown compound X is one of the four compounds listed in the table below. A mixture of X with o-toluic acid melts at 100 degrees Celsius, a mixture of X with benzoic acid melts at 112 degrees Celsius, a mixture of X with