A drug standard containing a mixture of barbiturates was analyzed by gas chromatography. With each barbiturate in the mixture at concentration of 5.0 mg/m L the average peak areas are; 1) 9.05, butabarbital. 2) 9.01, barbital. 3) 8.24 pentobarbital. 4) 9.02. secobarbital and 5) 6.32, hexobarbital. Calculate the response factor for each barbiturate using butabarbital as the internal standard.