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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?

By LeVanHan (Own work) [GFDL (http://www.gnu.org/copyleft/fdl.html) or CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons

A

2547 g/mol

B

47.50 g/mol

C

31.75 g/mol

D

1274 g/mol