Injection of 1ul of 19.5ppm benzene as well as octane are 3.5 and 7.6 min respectively isothermal run at 120 C Column HP- 1, 25m length, .25 mm I.D., 0.33u film thickness. Carrier gas flow rate is 0.8ml/min. compute the retention time of nonane on the same column at 150 C isothermal as well as at the same flow rate. Explain