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Behaviour of phosphorus pentachloride (PCl5)

PCl5 is a white solid, which volatilises at 160oC and melts at 148oC under pressure. Molten PCl5 conducts an electric current readily. At 180oC PCl5 vapour has a density of 9.3 g/L corrected to the standard conditions. At 250oC a sample of PCl5 exerts a pressure, which is twice the expected value. Discuss these observations and

Peptide Bonds

Draw the peptide Asn-Val-Ile-Cys and list the number of peptide bonds and what type of peptide is it (dipeptide, tripeptide etc...)?