Copper II Sulfide is formed when copper and sulfur are heated together. In this reaction, 172 g of copper reacts with 58 g of sulfur. After the reaction is complete, 19 g of sulfur still remains unreacted. What is the mass of copper sulfide formed?

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Elias is almost correct. he just got it backwards.the correct answer is that it demonstrates elastic potential energy transforming into kinetic energy.

The answer is d- principle of faunal succession.

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