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1

The reference is correct, from [1, p. 888]: Potassium formate: $\ce{HCOOK},$ colorless, deliquescent, rhombic crystals; $M_\mathrm{r}~84.12,$ density $1.91$, m.p. $\pu{167.5 °C}.$ P. is formed by neutralization of aqueous formic acid with potassium hydroxide or potassium carbonate. It is an industrial intermediate in the formate-potash process (see ...

0

Quantitatively, solubility is determined by the amount of a substance dissolved in a given amount of solvent under given conditions, which essentially is concentration. Various handbooks usually provide solubility in concentration units, which are universally interconvertible and can be used to express solubility in either units of molarity or molality. ...

5

Reference 1 reports the isomerization barrier for N‐methylacetohydroxamic acid. From the abstract: We have now determined the activation barrier to C–N rotation from major to minor conformation of a small secondary HA in $\ce{D2O}$ to be 67.3 kJ/mol. The HA rotational barrier scales with solvent polarity, as is observed in amides, although the HA barrier ...

6

This is not an answer to the question "can the sulfoxide be synthesized in significant yield" (and under which conditions). Instead, this is a "naive" prediction based on the data you provide and two assumptions: The predicted thermodynamic values in the articles you cite are accurate at 298 K. The heat and entropy of formation of (2) and (3) from (1) are ...

1

Manganese(IV) oxide decomposes around 500 °C (German Wikipedia lists $\pu{450 °C},$ [1, p. 396] lists $\pu{530–585 °C}):$ $$\ce{4 MnO2 ->[\sim\pu{500 °C}] 2 Mn2O3 + O2}\label{rxn:1}\tag{R1}$$ On the other hand, according to [2, p. 12], $\ce{Mn3O4}$ reacts with oxygen only above $\pu{500 °C}$ and forms manganese(III) oxide: \ce{4 Mn3O4 + O2 ->[>\...

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