A mixed-valence manganese complex has the empirical formula C18Mn7N18\text{C}_{18}\text{Mn}_7\text{N}_{18}C18Mn7N18. This compound consists of Mn2+\text{Mn}^{2+}Mn2+ ions, Mn3+\text{Mn}^{3+}Mn3+ ions, and cyanide (CN−\text{CN}^-CN−) ligands.
What are the numbers of Mn2+\text{Mn}^{2+}Mn2+ and Mn3+\text{Mn}^{3+}Mn3+ ions in one formula unit of this complex?
4 Mn2+ and 3 Mn3+4\text{ Mn}^{2+}\text{ and }3\text{ Mn}^{3+}4 Mn2+ and 3 Mn3+
3 Mn2+ and 4 Mn3+3\text{ Mn}^{2+}\text{ and }4\text{ Mn}^{3+}3 Mn2+ and 4 Mn3+
2 Mn2+ and 5 Mn3+2\text{ Mn}^{2+}\text{ and }5\text{ Mn}^{3+}2 Mn2+ and 5 Mn3+
5 Mn2+ and 2 Mn3+5\text{ Mn}^{2+}\text{ and }2\text{ Mn}^{3+}5 Mn2+ and 2 Mn3+
