4. (15 points total, 5 points each) Use Safety Data Sheets (SDS) to determine the TLVs, NFPA ratings and signal word, hazard statements and pictograms for ethanol, chlorine, and phosgene. 5. (20 points) An air mixture contains 4 ppm of carbon tetrachloride, 25 ppm of 1,1- dichloroethane, 5ppm of diethyl amine, 20ppm of cyclohexanol, and 10ppm of propylene oxide. Determine the mixture TLV and determine if this TLV has been exceeded. Use the following TLV data: Carbon tetrachloride: 5 ppm 1, 1- dichloroethane: 100 ppm Diethyl amine: 5 ppm Cyclohexanol: 50 ppm Propylene oxide: 2ppm