Transition metals, located in the centre of the periodic table, have many essential uses as elements and form many important compounds as well. Calculate the molecular mass of the following transition metal compounds:
(a) [Co(NH₃)₆]Cl₃ (b) [Pt(NH₃)₄BrCl]Cl₂ (c) K₄[V(CN)₆] (d) [Ce(NH₃)₆][FeCl₄]₃

The atomic mass of each element and add the atomic mass can be denoted as,

$$\begin{gathered} \mathbf{Molecular}\mathbf{}\mathbf{mass}\mathbf{=}\mathbf{}\mathbf{Atomic}\mathbf{}\mathbf{mass}\mathbf{}\mathbf{of}\mathbf{}\mathbf{Co}\mathbf{+}\mathbf{6}\mathbf{\times }\mathbf{Atomic}\mathbf{}\mathbf{mass}\mathbf{}\mathbf{of}\mathbf{}\mathbf{(}\mathbf{N}\mathbf{+}\mathbf{3}\mathbf{H}\mathbf{)} \\ \mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{+}\mathbf{3}\mathbf{\times }\mathbf{Atomic}\mathbf{}\mathbf{mass}\mathbf{}\mathbf{of}\mathbf{}\mathbf{Cl} \\ \mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{=}\mathbf{58}\mathbf{.}\mathbf{93}\mathbf{+}\mathbf{6}\mathbf{(}\mathbf{14}\mathbf{+}\mathbf{3}\mathbf{(}\mathbf{1}\mathbf{.}\mathbf{01}\mathbf{\left)}\mathbf{\right)}\mathbf{+}\mathbf{3}\mathbf{(}\mathbf{35}\mathbf{.}\mathbf{45}\mathbf{)} \\ \mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{=}\mathbf{267}\mathbf{.}\mathbf{46}\mathbf{}\mathbf{amu} \end{gathered}$$

The atomic mass of each element and add the atomic mass can be d $$\begin{gathered} \mathbf{Molecular}\mathbf{}\mathbf{mass}\mathbf{=}\mathbf{}\mathbf{Atomic}\mathbf{}\mathbf{mass}\mathbf{}\mathbf{of}\mathbf{}\mathbf{Pt}\mathbf{+}\mathbf{4}\mathbf{\times }\mathbf{Atomic}\mathbf{}\mathbf{mass}\mathbf{}\mathbf{of}\mathbf{}\mathbf{(}\mathbf{N}\mathbf{+}\mathbf{3}\mathbf{H}\mathbf{)}\mathbf{+}\mathbf{Atomic}\mathbf{}\mathbf{mass}\mathbf{}\mathbf{of}\mathbf{}\mathbf{Br} \\ \mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{+}\mathbf{3}\mathbf{\times }\mathbf{Atomic}\mathbf{}\mathbf{mass}\mathbf{}\mathbf{of}\mathbf{}\mathbf{Cl} \\ \mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{=}\mathbf{195}\mathbf{.}\mathbf{08}\mathbf{+}\mathbf{4}\mathbf{(}\mathbf{14}\mathbf{+}\mathbf{3}\mathbf{(}\mathbf{1}\mathbf{.}\mathbf{01}\mathbf{\left)}\mathbf{\right)}\mathbf{+}\mathbf{79}\mathbf{.}\mathbf{9}\mathbf{+}\mathbf{3}\mathbf{(}\mathbf{35}\mathbf{.}\mathbf{45}\mathbf{)} \\ \mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{=}\mathbf{449}\mathbf{.}\mathbf{45}\mathbf{}\mathbf{amu} \end{gathered}$$

The atomic mass of each element and add the atomic mass can be denoted as,

$$\begin{gathered} \mathbf{Molecular}\mathbf{}\mathbf{mass}\mathbf{=}\mathbf{}\mathbf{4}\mathbf{\times }\mathbf{Atomic}\mathbf{}\mathbf{mass}\mathbf{}\mathbf{of}\mathbf{}\mathbf{K}\mathbf{+}\mathbf{Atomic}\mathbf{}\mathbf{mass}\mathbf{}\mathbf{of}\mathbf{}\mathbf{V}\mathbf{+} \\ \mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{6}\mathbf{\times }\mathbf{Atomic}\mathbf{}\mathbf{mass}\mathbf{}\mathbf{of}\mathbf{}\mathbf{(}\mathbf{C}\mathbf{+}\mathbf{N}\mathbf{)} \\ \mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{=}\mathbf{4}\mathbf{(}\mathbf{39}\mathbf{.}\mathbf{1}\mathbf{)}\mathbf{+}\mathbf{50}\mathbf{.}\mathbf{94}\mathbf{+}\mathbf{6}\mathbf{(}\mathbf{12}\mathbf{.}\mathbf{01}\mathbf{+}\mathbf{14}\mathbf{)} \\ \mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{=}\mathbf{363}\mathbf{.}\mathbf{4}\mathbf{}\mathbf{amu} \end{gathered}$$

The atomic mass of each element and add the atomic mass can be denoted as,

$$\begin{gathered} \mathbf{Molecular}\mathbf{}\mathbf{mass}\mathbf{=}\mathbf{}\mathbf{Atomic}\mathbf{}\mathbf{mass}\mathbf{}\mathbf{of}\mathbf{}\mathbf{Ce}\mathbf{+}\mathbf{6}\mathbf{\times }\mathbf{Atomic}\mathbf{}\mathbf{mass}\mathbf{}\mathbf{of}\mathbf{}\mathbf{(}\mathbf{N}\mathbf{+}\mathbf{3}\mathbf{H}\mathbf{)} \\ \mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{+}\mathbf{3}\mathbf{\times }\mathbf{Atomic}\mathbf{}\mathbf{mass}\mathbf{}\mathbf{of}\mathbf{}\mathbf{(}\mathbf{Fe}\mathbf{+}\mathbf{4}\mathbf{Cl}\mathbf{)}\mathbf{-}\mathbf{-}\mathbf{\left(}\mathbf{1}\mathbf{\right)} \\ \mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{=}\mathbf{140}\mathbf{.}\mathbf{12}\mathbf{+}\mathbf{6}\mathbf{(}\mathbf{14}\mathbf{+}\mathbf{3}\mathbf{(}\mathbf{1}\mathbf{.}\mathbf{01}\mathbf{\left)}\mathbf{\right)}\mathbf{+}\mathbf{3}\mathbf{(}\mathbf{55}\mathbf{.}\mathbf{58}\mathbf{+}\mathbf{4}\mathbf{(}\mathbf{35}\mathbf{.}\mathbf{45}\mathbf{\left)}\mathbf{\right)} \\ \mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{=}\mathbf{835}\mathbf{.}\mathbf{25}\mathbf{}\mathbf{amu} \end{gathered}$$