Copper reacts with sulfur to from copper sulfide as shown in the equation. A scientist adds 12.7 grams of cu to 3.2 grams of s to start the reaction all of the copper and all of the sulfur react. Before running the experiment the scientist expected the products of the reaction will be a total of 15.9 grams of copper sulfide. Explain the law that the scientist used to predict that the product of the reaction would be 15.9 grams of copper sulfide
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