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Moderate

Percent Purity

APCHEM-CPGV9J

A 5.0 g sample of copper(II) oxide containing an inert contaminant is analyzed and found to contain 3.0 g copper.

Using molar masses of 64 g/mol for copper and 16 g/mol for oxygen, which of the following is the percent purity of the copper(II) oxide sample?

A

80%

B

75%

C

60%

D

50%