<P> AsCl and SbCl also adopt trigonal bipyramidal structures . The relevant bond distances are 211 pm (As − Cl), 221 pm (As − Cl), 227 pm (Sb − Cl), and 233.3 pm (Sb − Cl). At low temperatures, SbCl converts to the dimer, dioctahedral Sb Cl, structurally related to niobium pentachloride . </P> <P> PCl is prepared by the chlorination of PCl . This reaction is used to produce around 10,000 tonnes of PCl per year (as of 2000). </P> <Dl> <Dd> PCl + Cl ⇌ PCl (ΔH = − 124 kJ / mol) </Dd> </Dl> <Dd> PCl + Cl ⇌ PCl (ΔH = − 124 kJ / mol) </Dd>

What is the mass of one molecule of phosphorus pentachloride