The problem explains behaviour of phosphorus pentachloride (PCl5) at various temperatures from the point of bonding and structure.

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 comment on the species present in the melt and at 180o and 250o in the vapour.

Setting up pressure equations.

Set up the equations to solve: P air (torr) : P H2O (torr) : change of H vap: and lnP.

Working with rates of formation given reaction rates.

If NOCl is reacting at a rate of 0.24 mol/L.s, what is the rate of formation of Cl2(g)? 2NOCl(g) --> 2NO(g) + Cl2

Calculating the half life of a reaction.

For the first order reaction below, the intial concentration of A is 0.280M. If the concentration of A decreases to 0.0700 after 22.8 hours, what is the half-life of the reaction? A-->B rate=k[A]

Calculating the activation energy given the rate constant and change in temperature.

For a certain reaction, the rate constant doubles when the temperature is increased from 25 degrees Celsius to 41 degrees Celsius. What is the activation energy for this reaction? (R=8.31J/mol.K)