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A 0.543 g sample of copper oxide is heated in a properly prepared crucible. Its final mass after heating is 0.519 g.

Which of the following is the BEST explanation for this change in mass?

A

The crucible was not completely cooled when​ weighed.

B

The sample was improperly stored while cooling, causing moisture to be absorbed by the copper oxide.​

C

The copper oxide decomposed and oxygen gas was produced.

D

Black soot appeared on the crucible while heating, changing the masses obtained in the lab.

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