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The answer depends entirely on the type of chemical reaction.

If it's a chemical reaction that "splits" the molecules of the reactants into their constituent parts than no, the resulting number of atoms in the product would be equivalent to the sum of it's parts. Think dropping a magnesium strip in water, it splits the water into two hydrogen atoms and one oxygen, the magnesium strip burns off into a gaseous form.

However the nuclear reaction actually reduces the complexity of the molecules and their base parts (like chemical fission) into simpler forms (like actually changing one oxygen atom into 8 hydrogen atoms) then yes, the product would indeed have more atoms (though simpler) than the sum of it's parts.

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13y ago
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11y ago

False. The combined molar masses of the reactants is equal to the combined molar masses of the products.

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10y ago

Yes.

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Q: When a chemical change occurs the products have a greater mass than the reactants?
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