Estimate for sodium astatide (NaAt) according to the
Chapter 9, Problem 146P(choose chapter or problem)
Estimate \(\Delta H_{\mathrm{f}}^{\circ}\) for sodium astatide \((\mathrm {NaAt})\) according to the equation
\(\mathrm{Na}(s)+\frac{1}{2} \mathrm{At}_{2}(s) \longrightarrow \mathrm {NaAt}(s)\)
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