The law that the scientist used to predict that the product would be 15.9 grams of copper sulfide is: The Law of Conservation of Matter. Essentially, he used this idea to predict that there would be 15.9 grams of copper sulfide because all that a chemical reaction does is move the atoms around and if you add 12.7 to 3.2:
12.7
+3.2
--------
You get 15.9.
In conclusion, the reason he predicted this was because he added them and found out that it was 15.9 and because of the law, he had known that at that moment, he was right.
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The scientist figured out that the product would be 15.9 grams of copper sulfide by using something called the Law of Conservation of Matter. This law says that during a chemical reaction, the atoms just get rearranged, but the total amount stays the same. So, if you take 12.7 grams and add 3.2 grams:
12.7
You get 15.9 grams.
So, he knew it would be 15.9 because he added those numbers together, and the law told him he was correct!
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