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Molar Mass

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If a copper-containing compound contains 4.999% $Cu$ by mass, and there are two copper atoms per formula unit, what is the molar mass of the compound?

LeVanHan. Periodic Table. Digital Image. Wikipedia. Wikimedia Foundation, Inc., 2008 Web. 12 Jan. 2017.

A

2547 g/mol

B

47.50 g/mol

C

31.75 g/mol

D

1274 g/mol