1. Calculate the entropy change involved when one mole of liquidoxygen

1.	1. Calculate the entropy change involved when one mole of liquidoxygen is converted into gaseous oxygen at its boiling point of -180°C.Enthalpy of vapourisation of liquid oxygen is 6.820 J.
Answer» Answer: EXPLANATION:Using a phase diagram (on p. 772 in CHEMISTRY3) The normal melting and boiling points for methanol (CH3OH) are 175.7 K and 337.8 K, respectively. The critical temperature and PRESSURE are 512.8 K and 81 bar. The triple point occurs at 175.5 K. Sketch (not to scale) the singlecomponent phase diagram for methanol. Strategy Consider Figure 17.4, which shows a TYPICAL phase diagram for a one-component system. Remember that the normal melting and boiling points correspond to a pressure of 1 atm = 1.013 bar.

1. Calculate the entropy change involved when one mole of liquidoxygen is converted into gaseous oxygen at its boiling point of -180°C.Enthalpy of vapourisation of liquid oxygen is 6.820 J.

Answer»

Answer:

EXPLANATION:Using a phase diagram (on p. 772 in CHEMISTRY3)

The normal melting and boiling points for methanol (CH3OH) are 175.7 K and

337.8 K, respectively. The critical temperature and PRESSURE are 512.8 K and

81 bar. The triple point occurs at 175.5 K. Sketch (not to scale) the singlecomponent phase diagram for methanol.

Strategy

Consider Figure 17.4, which shows a TYPICAL phase diagram for a one-component

system. Remember that the normal melting and boiling points correspond to a

pressure of 1 atm = 1.013 bar.