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The total mass of the components in a chemical reaction's end products must match the total mass of the elements in the ______________.

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Product

Reactants

Both reactants and products

Catalyst

answer is B.

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Detailed Solution

A chemical reaction neither produces nor destroys mass. The entire mass of the elements present in a chemical reaction's products must match the total mass of the elements present in the reactants, in other words.

The Law of Conservation of Mass dates from Antoine Lavoisier's 1789 discovery that mass is neither created nor destroyed in chemical reactions.

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