Calculate the retention time for a compound for given number of carbon atoms. Fo

Question

Calculate the retention time for a compound for given number of carbon atoms.

For a homologous series of compounds (that is, compounds of similar structure that differ in the number of CH2 groups in a chain) the log of the adjusted retention time is usually a linear function of the number of carbon atoms. A compound was known to be a member ofthe fam?y (CH3 2CH CH 2 ??CH 20 CH y Fo e ollowing gas chromatographic adjusted retention times, prepare a graph of log t' versus n and perform a least squares analysis using Excel to find the equation of the best-fit line. 6 13 t', minutes 1.95 3.16 57.54 What are the values of the slope and intercept of this line? (Round your answer to 3 significant figures. The values do not have units.) 400.210 0.970 What is the value for n in the chemical formula of an unknown compound whose retention time is 13.49 minutes? 1e1 What would the retention time in minutes be for a compound in the same homologous series where n (Round your answer to the nearest 0.1 minute). X min

Explanation / Answer

ans

we are using that the formula

here using given above values.

logTr= nx+ b

logTr= 0.210(1)-0.970

Tr= Antilog (0.210-0.970)=0.174 min

so finallay 0.17 mins will be the retention time

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