Dichlorodifluoromethane, boiling point

The earliest traps specified in EPA s purge and trap methods contained equal amounts of Tenax, silica gel and coconut-based charcoal. Tenax absorbs compounds that are liquid, and silica gel substances that are gaseous, at room temperature. Charcoal is used to trap dichlorodifluoromethane (Freon 12), the boiling point of which is — 29°C. The superior adsorption and desorption efficiencies of these adsorbents for purge and trap analysis are supported through their continuous use today however, some alternative adsorbents have lately become popular for specific applications [47]. 

It is recommended that 1 cm of methyl-silicone-coated packing be inserted at the inlet to extend the life of the trap. Method 5030B from the SW-846 series is more specific than Method 502.2 and recommends a 3% OV-1 on Chromosorb-W, 60/80 mesh, or equivalent. Analysts who do not need to quantitate dichlorodifluoromethane do not need to use the charcoal and can replace this charcoal with more Tenax. If only analytes whose boiling points are above 35°C are to be determined, both the charcoal and the silica gel can be eliminated and replaced with Tenax. The trap needs to be conditioned at 180°C prior to use and vented to the atmosphere instead of the analytical GC column. It is also recommended that the trap be reconditioned on a... 

The compound dichlorodifluoromethane (CCI2F2) has a normal boiling point of — 30°C, a critical temperature of 112°C, and a corresponding critical pressure of 40 atm. If the gas is compressed to 18 atm at 20°C, will the gas condense Your answer should be based on a graphical interpretation. 

The compound dichlorodifluoromethane (CCI2F2) has a normal boiling point of — 30°C. a critical temperature of 112°C,... 

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