imagine a significant portion of your copper oxide sample (red oxide or black oxide) stuck to the sides of the test tube while you were weighing your sample and was unable to fully react over the course of the experiment. (it remained as copper oxide even after the reaction was done) would the calculated mass percent of copper in copper oxide be greater than, less than, or equal to the true mass percentage of copper in copper oxide?

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Mass Spectrometry

This process is an instrumental method in which a sample is changed to fast moving positive ions by electron bombardment. The charged particles vary due to their different mass to charge ratio and are estimated with the help of this difference. It is also called mass spectroscopy.