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# For the mineral torbernite, $\mathrm{Cu}\left(\mathrm{UO}_2\right)_2\left(\mathrm{PO}_4\right)_2 \cdot 8 \mathrm{H}_2 \mathrm{O}$, determine the element present in the greatest mass percent

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The element present in the greatest mass percent.

(1) Calculate for the molar mass of compound as shown below:

Molar mass = 1$\mathrm{M_{Cu}}$ + 2$\mathrm{M_{U}}$ + 20$\mathrm{M_{O}}$ + 2$\mathrm{M_{P}}$ + 16$\mathrm{M_{H}}$

Molar mass = (1 x 63.546 g/mol) + (2 x 236.02 g/mol) + (20 x 16 g/mol) + (2 x 30.9738 g/mol) + (16 x 1.008 g/mol)

Molar mass = ( 63.546 g Cu + 472.04 g U + 320 g O + 61.9476 g P + 16.128 g H) / mol Compound

$\textbf{Thus, the element present in the greatest mass percent is U.}$

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