A student analyzes sample 1, and sample 2 chromatograms of a mixture containing two compounds (A + B). The following data is obtained: Sample 1: Retention time Area Height % Area 0.210 19.20 15.68 5.57 0.650 243.62 89.37 70.74 1.74 81.57 13.42 23.68 Sample 2: 0.290 64.81 49.90 12.17 0.69 11.61 4.19 2.18 1.95 456.31 43.46 85.66 Using the data from the four compounds below, answer the following questions: Compound (b.p. °C) Retention time Area Height % Area Air 0.280 14.29 8.85 2.81 Hexane (69) 0.666 93.40 33.76 18.34 Cyclohexane (80.7) 0.980 124.66 30.48 24.48 Pentane (98.4) 1.216 112.27 24.18 22.05 Toluene (110.6) 1.830 164.59 21.64 32.32

With the following information for a GC analysis using an internal standard, calculate the percentage of alcohol in the sample. The 1% ethanol standard sample has an ethanol peak area of 711 and a 1-propanol peak area of 9253; 3% is 3536 and 14432 for ethanol and 1-propanol respectively; 5% is 3506 and 10693; 7% is 5874 and 10847 and 9% is 5203 and 7522. The beer sample has an ethanol peak area of 5471 and 1-propanol of 14384. 4.95% 5.15% 5.05% 5.25%

A gas chromatogram of a mixture of toluene and ethyl (a) Measure w1/2 for each peak to the nearest 0.1 mm. When the thickness of the pen trace is significant relative to the length being measured, it is important to take the pen width into account. It is best to measure from the edge of one trace to the corresponding edge of the other trace, as shown at the bottom of the left column. (b) Find the number of theoretical plates and the plate height for each peak.

I have set up my spreadsheet and was able to reproduce the result with a pKa of 4.64. TRUE OR FALSE