Curium chemical data help 2

[MHodges]

I am using ASPEN+ for a Cm/Am separation however the databank doesn't have Cm listed. I need some help filling in the data. I have Perry's but I can't seem to find an Cm info in Table 2-1 or anywhere else. Do you guys a) have this info or b) know where I can find it.

I need the specific gravity at 60F, the standard enthalpy of formation and standard Gibbs of formation.

Thanks for any help!

 

[25362]

I don't think you"ll find these properties on the net or in university chemistry books. Try a good library for books on transuranics, or on the actinide series of elements, or about the trans-americium elements, or, in general, books or journals on nuclear chemistry.

 

[rbcoulter]

Don't think elements have standard H & G of formations. Cm SG = 13.51 , Source: CRC handbook 73rd edition

 

[25362]

Rbcoulter is absolutely right. The standard molar enthalpy (heat) of formation at 298.15 K and 1 atmosphere, [Δ]H_f^o, for solid elements (if that is their most stable form) is taken as zero by definition. But as a gas, a liquid, an ion or an allotropic form, it would have a non-zero value.

Take as an example, graphite ([Δ]H_f^o=0), and diamond ([Δ]H_f^o=1.9 kJ/mol, and [Δ]G_f^o=2.9 kJ/mol).

The standard molar Gibbs energy of formation at 298.15 K and 1 atm., [Δ]G_f^o = [Δ]H_f^o- T[Δ]S^o = 0.
Where the entropy is measured in J/(K.mol) and has a non-zero value at the standard state.

The Gibbs free energy of formation (a state function) serves us to identify whether a reaction would be spontaneous or not.

[&Delta;]G_sys < 0 spontaneous process
[&Delta;]G_sys = 0 reversible (equilibrium) process
[&Delta;]G_sys > 0 nonspontaneous process

Note that spontaneity doesn't mean speed.

The standard state of the Cm is a solid metal. Density: as above; MP: 1340^oC.