An unknown compound was analyzed by GC with octane (C3H13) and decane (C10H22). The adjusted retention times were 14.6 min for octane, and 31.6 min for decane. Calculate the retention index for the unknown if its adjusted retention time was 21.2 min.

An unknown compound was analyzed by GC with octane (C3H13) and decane (C10H22). The adjusted retention times were 14.6 min for octane, and 31.6 min for decane. Calculate the retention index for the unknown if its adjusted retention time was 21.2 min.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

See similar textbooks

Related questions

Q: In molecular exclusion (size exclusion) chromatography, molecules have the the longest retention…

A: Molecular exclusion chromatography is base on size of molecules. It is a separation technique that…

Q: Gas Chromatography of a Mixture Response 3 Time minutes 7

A: Retention time for first unknown compound = 3 min

Q: Consider the peaks for pentafluorobenzene and benzene in the chromatogram shown below. The elution…

A: Since you have posted a question with multiple sub-parts, we will solve the first three sub-parts…

Q: two chromatograms after LC separation. Which chromatogram is better to proceed for MS analysis? What…

A: LCMS is Liquid chromatography–mass spectrometry used for separation, identification and percentage…

Q: Sketch a diagram of the GC data expected from a mixture that is 75% 1-pentanol and 25% 1-propanol.…

A: "GC" typically refers to Gas Chromatography, a widely used analytical technique in chemistry. Gas…

Q: Retention time Substance(s) Peak area (%) (min) Crude product Pure product 8.725 1,2-cyclohexanediol…

A: In the analysis of gas chromatography, the evaluation of peak area is one of the most important…

Q: A solution containing 2.30 mM of X (analyte) and 1.15 mM of S (standard) gave peak areas of 1728 and…

A: Given, known Amount of X = 2.30 mM, amount of S = 1.15 mM Peak area of X is 1728 and that of S is…

Q: Metal ions chelate polar groups of analyte molecules for longer retention time. Does this affect…

A: HPLC is based on the principle where the sample (analyte) is distributed between a mobile phase…

Q: A student analyzes sample 1, and sample 2 chromatograms of a mixture containing two compounds (A +…

A: The two samples( Compound A+Compound B ) are undergone chromatography : Compound A and Compound B

Q: How to interept this data to match the structure? It gives the peak/PPM and having trouble matching…

A: The given NMR data is needed to be interpreted and the each signal obtained is needed to be assigned…

Q: cyclopentane pyrrolidine tetrahydrofuran area A = 100 intensity area B = 70 area C= 180 retention…

A: Gas chromatogram a mixture of three compounds pyrrolidine, tetrahydrofuran and cyclopentane.

Q: Describe how to obtain a Retention Factor. What does the retention factor tell you?

A: Retention factor of a material is the ratio of the distance the spot moved above the origin to the…

Q: Intensity (%) 8- 8- MS - scan #238 (unknown) Scan 238 100%=10,237 Retenlion time 2.61 min. TIC =…

A: The above compound is ethanol. Molecular ion at m/z = 46. Loss of 15 is observed. Loss of hydrogen…

Q: Nonpolar aromatic compounds were separated by HPLC on an octadecyl(C18) bonded phase. The mobile…

Q: What is the relative retention of the two solute?

A: relative retention of the two solute

Q: Consider a separation performed on a 30.0 mm long open tubular column with a 0.50 mm diameter and a…

A: Length of column(L) = 30.0 mmDiameter of column(d) = 0.50 mmThickness(t) = 2.0 micrometerRetention…

Q: A new dye (DYE C) was developed and was analyzed against other dyes using paper chromatography. A…

A: TLC is an analytical technique which can be used to monitor the organic reaction transformations.…

Q: A mixture of benzene, toluene, and methane was injected into a gas chromatograph. Methane gave a…

A: The amount of time required for each component to reach the detector following the mixture's…

Q: Suppose that you try separating an unknown mixture by normal-phase chromatography with the solvent…

A: Whether to use a higher or lower percentage of hexane in the next run for the separation of an…

Q: B. There was big news all over the internet that the Ponkan oranges that were imported from one of…

A: The objective of the question is to calculate the following parameters for the given chromatographic…

Q: The widths at half-height, wi/2, of the peaks for compounds A and B are 0.123 min and 0.299 min,…

Q: . Consider the chromatogram shown below (used with permission from the Honors Thesis of Mark…

A: “Since you have posted a question with multiple sub-parts, we will solve first three subparts for…

Q: Determine the Kovats retention index for an unknown C9 sample using the retention times 1.3 min for…

A: Calculate retention index for an unknown C9 sample.

Q: 5) Which of the following compounds gives a single E2 product on reaction with sodium ethoxide,…

A: Elimination reaction of alkyl halide: Alkyl halide gives an elimination reaction by reacting with a…

Q: A sample of drinking water was tested for Pb+ and was found to have a Pb²* concentration of 17.46…

A: Given the concentration of the unspiked sample, Cunspiked = 17.46 ppb Now 1.00 mL of 2.29 ppb Pb2+…

Q: 2-pentanone has a retention index of 987 on a poly(ethylene glycol) column (also called Carbowax).…

A: Given: 2-pentanone has a retention index of 987 on a poly(ethylene glycol) column (also called…

Q: 1)Explain the peak order based on the structure of the compounds in an hold: paracetamol,…

A: Ans 1. In High-Performance Liquid Chromatography (HPLC), the elution order of compounds is…

Q: Reagent Blank Absorbance Concentration of Stock Solution: 10 ppm Volume of Stock Solution (mL) Total…

Q: A solute with a retention time of 407 seconds has a width at the base of 13.0 seconds on a column…

A: The objective of the question is to calculate the Number of Theoretical PlatesPlate Height

Q: Consider a 22.0 cm long column with a plate height of 0.0125 mm, a flow rate of 1.0 mL/min, and a Vm…

A: The objective of the question is to calculate the solute retention time, retention volume, and peak…

Q: trying benzophenone using column chromatography. They have prepared a mixture of standard…

Q: A single analysis using chromatography produced a chromatogram with three peaks. The peak for…

A: Since you have asked a question with multiple sub-parts, we will solve first three sub-parts for…

Q: Olivia developed a new dye called Dye C. It was analyzed against other dyes using paper…

Q: From the six analytes listed below, n-octanal, n-octane, 1-chlorooctane, n-octanol, n-heptane, and…

A: The objective of the question is to predict the retention order of six analytes: n-octanal,…

Q: 7. Draw the structure of ethyl acetate and propyl acetate. Which substance is 6 expected to have the…

A: Introduction: Chromatography is a technique used to separate the mixture of solution. There are two…

Q: Retention volume in a chromatographic experiment 1) increases with decreasing length of the column…

A: Retention volume VR is the volum of eluent carrier gas admitted to the column between the injection…

Q: 3. The following questions pertain to the two gas chromatograms of the same straight chain…

A: The objective of this question is to show the chromatogram A and broadening peaks indicate possible…

Q: Question 19 Gas chromatography can determine the concentration of a component in a mixture by…

A: Answer is true In gas chromatography by measuring retention time.by this value then we know the…

Q: In a 250.0 mL beaker, 10.0 mL 0.200 M H3PO4, 20.0 mL 0.400 M Na3PO4, 10.0 mL of 0.200 M NaOH and…

Q: What is the %composition of the Vitamin A peak in the sample?

A: To determine the % composition of the Vitamin A peak in the sample.

Q: In a reverse phase chromatography setup, which of the following compounds will have the HIGHEST…

Q: i) Determine the adjusted retention times for substance x and y. ii) Calculate the retention factors…

A: Since you have asked a question with multiple subparts, we will answer first three subparts for you.…

Concept explainers

Mass Spectrometry

This process is an instrumental method in which a sample is changed to fast moving positive ions by electron bombardment. The charged particles vary due to their different mass to charge ratio and are estimated with the help of this difference. It is also called mass spectroscopy.

Question

An unknown compound was analyzed by GC with octane (C3H18) and decane (C10H22). The adjusted
retention times were 14.6 min for octane, and 31.6 min for decane. Calculate the retention index for the
unknown if its adjusted retention time was 21.2 min.

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Step by step

Solved in 2 steps

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.

Similar questions

As solvent polarity increases, the Retention Factor (Rf) of compounds on the TLC plate increases. Group of answer choices True False
If retention times found on a chromatogram are 0.60 min for CH4 (=tm), 7.0 min for pentane, 8.0 min for an unknown species, and 10.0 min for hexane, find the Kovat's retention index for the unknown.
In a reverse-phase separation, a solute was found to have a retention time of 19.6 min, while an unretained peak had a retention time of 1.45 min when the mobile phase was 20/80 v/v% methanol/water. (b) Calculate the k’ for the solute. (c) Calculate the new k’ if the mobile phase is changed to 60/40 methanol/water assuming identical void volume. (d) Calculate a solvent composition that would bring k’ from initial value to a value of 1.20 using tetrahydrofuran/water mobile phase rather than 20/80 v/v % methanol/water.
Gas chromatography cannot analyze mixtures due to the sensitivity of the instrument. True False
You are trying to separate a sample with 2 components: X and Y with GC. X has a lower boiling point than Y. Which one has a higher retention time? What is the most common way to increase retention of analytes in gas chromatography?
The figure below shows a typical separation of several fat-soluble vitamins by HPLC. The x-axis is retention time in minutes. From the graph try to estimate retention times for peaks 2 and 3. Retention time peak 2 = Retention time peak 3 = Assume that w1/2 is 0.15 minutes for peak 2 and 0.16 minutes for peak 3. Assume that tm is 2.00 minutes. How much time does gamma-tocopherol spend in the stationary phase? From tr and w1/2 find N for the peak that elutes first. From tr and w1/2 find the resolution of peaks 2 and 3 Calculate α for these peaks. If the flow rate for the column is 1.2 mL/minute what is the retention volume for peak 4?
QUESTION 5 In a chromatographic separation using a polar stationary phase and a mobile phase composed of 60% hexane and 40% ethyl acetate, two compounds, benzene (peak A) and toluene (peak B), are eluted. The width of peak A at its base is 1.2 min, the width of peak B at its base is 1.3 min, and the retention time of peak A is 5.2 min and peak B is 3.5 min. What is the resolution (Rs) between these two peaks and is it acceptable? R = 1.36. It is not an acceptable resolution. R = 0.74. It is an acceptable resolution. R = 1.36. It is an acceptable resolution. R = 0.74. It is not an acceptable resolution.
A GC-MS was used to analyze an unknown sample. Based off the chromatogram, at least how many different compounds were in this sample? Detector Signal u M Retention Time
A mixture of three compounds was chromatographed using a silica gel column with diethyl ether/hexanes (10:90) as the eluting solvent. Fractions were collected and TLC analysis of each fraction was performed, with the results shown here: A 3 4 7 8 Mixture before separation Which fractions should be combined to give pure samples of A, B and C?
The data in the following table were extracted from a gas chromatographic analysis of a two- component mixture. Air nonane decane Retention time (s) 5 26 32 Peak width, baseline (s) 5 4 (i) Calculate the capacity factor, k, for the two compounds. (ii) Calculate the selectivity factor, a, for the two compounds.
In a chromatographic analysis of an unknown mixture, compound A has a retention time of 5.56 minutes and a baseline width of O.87, and compound B has a retention time of 6.32 minutes and a baseline width of 0.53 minutes. Are these peaks resolved, and what is the resolution between the two peaks? O Yes, 1.09 O Yes, 0.54 O No, 0.54 O No, 1.09 O There is not enough information given to determine the resolution
What is the best Chromatography instrument for analysis of Soluble Protein molecules CG-FID GC-MS LC-MS IC-MS O IC-EC