The temperature at which the following process reaches equilibrium at 1.0 atm is the normal melting point for phosphoric acid.
H3PO4(s) 
H3PO4(l)
Use the following thermodynamic data at 298 K to determine this temperature.
Definitions:
Lac Operon
A regulatory unit in the DNA of bacteria that controls the metabolism of lactose, consisting of genes coding for proteins involved in lactose processing and the regulatory elements controlling them.
Structural Genes
Genes that code for proteins which serve as building blocks for cells and tissues or take part in chemical reactions within the organism.
Regulatory Sequences
DNA sequences that are involved in controlling the expression of genes, determining when and where genes are turned on or off.
Repressible Operon
An operon that is normally active, but can be controlled by a repressor protein, which becomes active when it binds to a corepressor; the active repressor binds to the operator, making the operon transcriptionally inactive. Compare with inducible operon.
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