Copper Was the First Metal to Be Produced from Its

Multiple Choice

Copper was the first metal to be produced from its ore because it is the easiest to smelt, that is, to refine by heating in the presence of carbon (hence the early occurrence of the Bronze Age) . The ore was likely malachite (Cu₂(OH) ₂CO₃) . What is the mass percent of copper in malachite?

A) 28.7%
B) 45.2%
C) 57.5%
D) 40.3%
E) 74.6%