For a homologous series of compounds (that is, compounds of similar structure th

Question

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 of the family (CH3)2CH(CH2)CH2OSi(CH3)3. For the following gas chromatographic adjusted retention times, prepare a graph of log tr' versus n and perform a least squares analysis using Excel to find the equation of the best-fit line. 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.) What is the value for n in the chemical formula of an unknown compound whose retention time is 339.63 minutes? 16 What would the retention time in minutes be for a compound in the same homologous series where n = 10? (Round your answer to the nearest 0.1 minute). 253 x min

Explanation / Answer

logTr= nx+ b

logTr= 0,217(10)-0,940

Tr= Antilog (2,170-0,940)=16.98 min

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