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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. tr', n 4.0 minutes 7 8 14 3.68 5.94 105.20 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.) 4.0 What is the value for n in the chemical formula of an unknown compound whose retention time is 1.41 minutes? What would the retention time in minutes be for a compound in the same homologous series where n = 9? (Round your answer to the nearest 0.1 minute). 4.0 min