You are a health and safety manager working on a superfund site in the middle of a very hot summer. the site has a variety of old rusted 55-gallon drums. the site is a former chemical manufacturing plant. the plant manufactured chlorinated volatile organic compounds including tetra-chloroethylene, trichloroethylene, vinyl chloride and carbon tetrachloride. you have been tasked with preparing a site-specific health and safety plan for your company. the tasks include collecting samples from the drums.

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.

6.4 cm (max) - 25 cm (min)

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.