Question

6.10 Calculate enthalpies of formation for the respective complexes from the stability constants tabulated below. (a) \begin{tabular}{lccc} Monothiocyanatouranium(IV) : & & & \\ $ \mathrm{T} / \mathrm{K} $ & 283.2 & 298.2 & 313.2 \\ $ K_{1} / \mathrm{dm}^{3} \mathrm{~mol}^{-1} $ & 60 & 33 & 20 \end{tabular} (b) Mono(ethane-1,2-diamine)nickel(II) : \{The answer is $ -27 \mathrm{~kJ} \mathrm{~mol}^{-1} $ \} \[ \begin{array}{lrrrr} \mathrm{T} / \mathrm{K} & 283.2 & 293.2 & 303.2 & 313.2 \\ \log _{10}\left\{K_{1} / \mathrm{dm}^{3} \mathrm{~mol}^{-1}\right\} & 7.74 & 7.52 & 7.27 & 7.04 \end{array} \] \{The answer is $ -38 \mathrm{~kJ} \mathrm{~mol}^{-1} $ \} (c) \[ \begin{array}{lcc} \text { Monocysteinatomercury(II) : } & & \\ \mathrm{T} / \mathrm{K} & 285.2 & 298.2 \\ \log _{10}\left\{K_{1} / \mathrm{dm}^{3} \mathrm{~mol}^{-1}\right\} & 45.4 & 43.6 \end{array} \] (d) Monoacetatomercury(II) : \begin{tabular}{lccc} $ \mathrm{T} / \mathrm{K} $ & 293.2 & 300.2 & 307.2 \\ $ K_{1} / \mathrm{dm}^{3} \mathrm{~mol}^{-1} $ & 3600 & 3330 & 3130 \end{tabular} (e) \begin{tabular}{lccc} Monothiocyanatoneodymium(III) : & & \\ $ \mathrm{T} / \mathrm{K} $ & 298.2 & 313.2 & 328.2 \\ $ \log _{10}\left\{K_{\mathrm{l}} / \mathrm{dm}^{3} \mathrm{~mol}^{-1}\right\} $ & 0.81 & 0.61 & 0.47 \\ Monothiocyanatonickel(II) : & & & \\ $ \mathrm{T} / \mathrm{K} $ & 288.2 & 298.2 & 308.2 \\ $ \log _{10}\left\{K_{\mathrm{l}} / \mathrm{dm}^{3} \mathrm{~mol}^{-1}\right\} $ & 1.34 & 1.24 & 1.17 \end{tabular} Compare the relative values for the three thiocyanate complexes, for the two nickel complexes, and for the two mercury complexes; comment on your comparisons.

          6.10 Calculate enthalpies of formation for the respective complexes from the stability constants tabulated below.
(a)
\begin{tabular}{lccc} 
Monothiocyanatouranium(IV) : & & & \\
\( \mathrm{T} / \mathrm{K} \) & 283.2 & 298.2 & 313.2 \\
\( K_{1} / \mathrm{dm}^{3} \mathrm{~mol}^{-1} \) & 60 & 33 & 20
\end{tabular}
(b)
Mono(ethane-1,2-diamine)nickel(II) :
\{The answer is \( -27 \mathrm{~kJ} \mathrm{~mol}^{-1} \) \}
\[
\begin{array}{lrrrr}
\mathrm{T} / \mathrm{K} & 283.2 & 293.2 & 303.2 & 313.2 \\
\log _{10}\left\{K_{1} / \mathrm{dm}^{3} \mathrm{~mol}^{-1}\right\} & 7.74 & 7.52 & 7.27 & 7.04
\end{array}
\]
\{The answer is \( -38 \mathrm{~kJ} \mathrm{~mol}^{-1} \) \}
(c)
\[
\begin{array}{lcc}
\text { Monocysteinatomercury(II) : } & & \\
\mathrm{T} / \mathrm{K} & 285.2 & 298.2 \\
\log _{10}\left\{K_{1} / \mathrm{dm}^{3} \mathrm{~mol}^{-1}\right\} & 45.4 & 43.6
\end{array}
\]
(d) Monoacetatomercury(II) :
\begin{tabular}{lccc}
\( \mathrm{T} / \mathrm{K} \) & 293.2 & 300.2 & 307.2 \\
\( K_{1} / \mathrm{dm}^{3} \mathrm{~mol}^{-1} \) & 3600 & 3330 & 3130
\end{tabular}
(e)
\begin{tabular}{lccc} 
Monothiocyanatoneodymium(III) : & & \\
\( \mathrm{T} / \mathrm{K} \) & 298.2 & 313.2 & 328.2 \\
\( \log _{10}\left\{K_{\mathrm{l}} / \mathrm{dm}^{3} \mathrm{~mol}^{-1}\right\} \) & 0.81 & 0.61 & 0.47 \\
Monothiocyanatonickel(II) : & & & \\
\( \mathrm{T} / \mathrm{K} \) & 288.2 & 298.2 & 308.2 \\
\( \log _{10}\left\{K_{\mathrm{l}} / \mathrm{dm}^{3} \mathrm{~mol}^{-1}\right\} \) & 1.34 & 1.24 & 1.17
\end{tabular}

Compare the relative values for the three thiocyanate complexes, for the two nickel complexes, and for the two mercury complexes; comment on your comparisons.

$6.10 Calculate enthalpies of formation for the respective complexes from the stability constants tabulated below. (a) Monothiocyanatouranium(IV) : T / K 283.2 298.2 313.2 K1 / dm^3 mol^-1 60 33 20 (b) Mono(ethane-1,2-diamine)nickel(II) : {The answer is -27 kJ mol^-1 } T / K 283.2 293.2 303.2 313.2 log10{K1 / dm^3 mol^-1} 7.74 7.52 7.27 7.04 {The answer is -38 kJ mol^-1 } (c) Monocysteinatomercury(II) : T / K 285.2 298.2 log10{K1 / dm^3 mol^-1} 45.4 43.6 (d) Monoacetatomercury(II) : T / K 293.2 300.2 307.2 K1 / dm^3 mol^-1 3600 3330 3130 (e) Monothiocyanatoneodymium(III) : T / K 298.2 313.2 328.2 log10{Kl / dm^3 mol^-1} 0.81 0.61 0.47 Monothiocyanatonickel(II) : T / K 288.2 298.2 308.2 log10{Kl / dm^3 mol^-1} 1.34 1.24 1.17 Compare the relative values for the three thiocyanate complexes, for the two nickel complexes, and for the two mercury complexes; comment on your comparisons.$

Added by Colton C.

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