Mass % Pt:

$\mathbf{\%}\mathbf{}\mathbf{mass}\mathbf{}\mathbf{Pt}\mathbf{=}\frac{\mathbf{mass}\mathbf{}\mathbf{Pt}\mathbf{}\mathbf{in}\mathbf{}{\mathbf{PtCl}}_{\mathbf{2}}{\mathbf{\left(}{\mathbf{NH}}_{\mathbf{3}}\mathbf{\right)}}_{\mathbf{2}}}{\mathbf{molar}\mathbf{}\mathbf{mass}\mathbf{}{\mathbf{PtCl}}_{\mathbf{2}}{\mathbf{\left(}{\mathbf{NH}}_{\mathbf{3}}\mathbf{\right)}}_{\mathbf{2}}\mathbf{}}\mathbf{\times}\mathbf{100}$

- molar mass PtCl
_{2}(NH_{3})_{2}= 300.04 g/mol - atomic mass Pt = 195.08 g/mol

Calculate the percentage by mass of the indicated element in the following compounds.

Platinum in PtCl_{2}(NH_{3})_{2}, a chemotherapy agent called cisplatin. Express your answer using four significant figures.

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