21. Koja od navedenih tvrdnja točno opisuje vrijednosti standardnih entalpija stvaranja iona pri tlaku \(10^{5} \mathrm{~Pa}\) u reakciji prikazanoj zadanom termokemijskom jednadžbom? \(\mathrm{Cu}^{2+}(\mathrm{aq})+\mathrm{Zn}(\mathrm{~s}) \rightarrow \mathrm{Cu}(\mathrm{~s})+\mathrm{Zn}^{2+}(\mathrm{aq}) ; \Delta_{\mathrm{r}} H^{\circ}=-218,7 \mathrm{~kJ} \mathrm{~mol}^{-1}\) A. \(\Delta_{\mathrm{f}} H^{\circ}\left(\mathrm{Zn}^{2+}, \mathrm{aq}\right)=-153,9 \mathrm{~kJ} \mathrm{~mol}^{-1} ; \Delta_{\mathrm{f}} H^{\circ}\left(\mathrm{Cu}^{2+}, \mathrm{aq}\right)=64,77 \mathrm{~kJ} \mathrm{~mol}^{-1}\) B. \(\Delta_{\mathrm{f}} H^{\circ}\left(\mathrm{Zn}^{2+}, \mathrm{aq}\right)=153,9 \mathrm{~kJ} \mathrm{~mol}^{-1} ; \Delta_{\mathrm{f}} H^{\circ}\left(\mathrm{Cu}^{2+}, \mathrm{aq}\right)=-64,77 \mathrm{~kJ} \mathrm{~mol}^{-1}\) A. C. \(\Delta_{\mathrm{f}} H^{\circ}\left(\mathrm{Zn}^{2+}, \mathrm{aq}\right)=-153,9 \mathrm{~kJ} \mathrm{~mol}^{-1} ; \Delta_{\mathrm{f}} H^{\circ}\left(\mathrm{Cu}^{2+}, \mathrm{aq}\right)=-64,77 \mathrm{~kJ} \mathrm{~mol}^{-1}\) B. D. \(\Delta_{\mathrm{f}} H^{\circ}\left(\mathrm{Zn}^{2+}, \mathrm{aq}\right)=153,9 \mathrm{~kJ} \mathrm{~mol}^{-1} ; \Delta_{\mathrm{f}} H^{\circ}\left(\mathrm{Cu}^{2+}, \mathrm{aq}\right)=64,77 \mathrm{~kJ} \mathrm{~mol}^{-1}\) C. D.
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