Suppose you start with 0.303 g of copper wire and faithfully follow the procedure. At the end you find that the copper dust weighs 0.309 g. Based on your understanding of the experimental procedure, offer at least two rational explanations for this apparent violation of the law of conservation of mass.

Hi, the given question has some missing parts as the experimental procedure has not been mentioned.

Explanation:

In general, violation of conservation of mass could be ascribed to following factors-

(1) Copper might be oxidized to copper oxide through aerial oxidation which has higher molar mass than metallic copper.

(2) Presence of moisture could lead to increase in mass. So proper drying is needed.

(3) As difference in mass arises at third decimal point therefore accurate weighing of sample is required during experiment.

altitude, density, pressure

air gets less dense the higher the altitude and also the air pressure is less as altitude rises.

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explanation: