Achemistry student combines 32 grams of one chemical and an unknown amount of another chemical in a closed system. a chemical reaction occurs and the mass of the products is 114 grams. how much of the unknown chemical was used in the reaction?

The reaction used 82 g of the unknown chemical.

The word equation is  

Chemical 1 + Chemical 2 → Products  

     32 g    +         x g        →     114 g  

The Law of Conservation of Mass tells us the total mass of the reactants must equal the mass of the products. Then  

32 g + x g = 114 g  

x = 114 – 32 = 82

The mass of Chemical 2 was 82 g.  

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