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All chemist. weighs A cylinder Of compressed oxygen O2. And finds that it Has a mass of 102 7.8 gram. After some of the oxygen is used in an experiment. The cylinder has the mass of 102 3.2 grams.

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To find the mass of the oxygen used in the experiment, we need to subtract the final mass of the cylinder from the initial mass of the cylinder.

Final mass of cylinder = 102.3.2 grams
Initial mass of cylinder = 102.7.8 grams

Mass of oxygen used = Initial mass - Final mass
= 102.7.8 grams - 102.3.2 grams
= 4.6 grams

Therefore, the mass of oxygen used in the experiment is 4.6 grams.
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