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Curium chemical data help
2

Curium chemical data help

Curium chemical data help

(OP)
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!

RE: Curium chemical data help


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.

RE: Curium chemical data help

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

RE: Curium chemical data help


Rbcoulter is absolutely right. The standard molar enthalpy (heat) of formation at 298.15 K and 1 atmosphere, ΔHfo, 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 (ΔHfo=0), and diamond (ΔHfo=1.9 kJ/mol, and ΔGfo=2.9 kJ/mol).

The standard molar Gibbs energy of formation at 298.15 K and 1 atm., ΔGfo = ΔHfo- TΔSo = 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.

ΔGsys < 0  spontaneous process
ΔGsys = 0  reversible (equilibrium) process
ΔGsys > 0  nonspontaneous process

Note that spontaneity doesn't mean speed.

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

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