23-D. A gas chromatogram of a mixture of toluene and ethyl ace- tate is shown he

Question

23-D. A gas chromatogram of a mixture of toluene and ethyl ace- tate is shown here. Toluene Ethyl acetate Start Time (a) Use the width of each peak (measured at the base) to calculate the number of theoretical plates in the column. Estimate all lengths to the nearest 0.1 mm (b) Using the width of the toluene peak at its base, calculate the width expected at half-height. Compare the measured and calcu- lated values. When the thickness of the line is significant relative to the length being measured, it is important to take the pen line width into account. You can measure from the edge of one line to the cor- responding edge of the other line, as shown here.

Explanation / Answer

The number of theoretical plates, N can be determined using the equation:

N = 16(t/W)2, where t = retention time of the analyte and W = Width of the peak of the analyte.

The given question is incomplete as the retention time is not mentioned.

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