Argon freezing point

The carbonyls are placed in hexadecane solution under argon. The solutions are injected into a bath of molten phenanthrene (m.p. 101° b.p. 340°) or pyrene (m.p. 149° b.p. 410°), whose freezing points are somewhat below the temperature required for the decomposition of the metal carbonyl complexes. 

Camphor is an almost spherical molecule of molecular mass 152.24 and melting temperature 451.6 K. Argon has a molecular mass of 39.948 and a melting temperature of 83.8 K. Both have an approximate entropy of fusion of 14 J/(K mol). Discuss their heats of fusion and their freezing-point-lowering constants. 

There has been some controversy about the need for N2 in the formation of HD. Burgess et al. [29] reported that N2 was not required. They used argon as their diluent gas and took the word of the supplier that it was free of N2. Not only is commercial argon seldom free of N2, but it is difficult to remove the last traces of N2, and very little N2 is required to support HD formation. To settle this difference in experimental observations, Li and Burris [30] made it a point to rid their diluent gas of contaminating N2. One can absorb N2 on molecular sieve at liquid N2 temperature the problem is that argon liquefies and freezes before you get down to die temperature of liquid N2. So Li used neon as his inert gas and captured any contaminating N2 on molecular sieve in a liquid N2 bath. When the atmosphere above the nitrogen-ase system was carefully freed of N2 there was no formation of HD. 

Coasne et al.311 studied freezing and melting of a binary mixture of argon and krypton in a structureless slit pore. Comparison of the results with the bulk mixture are made. Interestingly it is found that the melting point increases in these systems compared to the bulk, in qualitative agreement with experiment. 

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