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Oxides and Oxoanions

A 0.543 g s...

Question

A $0.543 g$ sample of copper oxide is heated in a properly prepared crucible. Its final mass after heating is $0.519 g$ .
What is the best explanation for this change in mass?

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Solution

The copper oxide decomposed and oxygen gas was produced while heating. Oxygen gas escaped out of the crucible, lowering the mass of the product left in the crucible.
So, ,the mass reduces from $0.543 g$ to $0.519 g$ .

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