Asked by rebecca
If all the reactants in a chemical reaction are completely used, which of the following statements accurately describes the relationship between the reactants and the products?
The products must have a different mass than the reactants.
The total mass of the reactants must equal the total mass of the products.
The total mass of the reactants must be greater total mass of the products.
All Answers 1
Answered by
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The correct statement is: "The total mass of the reactants must equal the total mass of the products."
Reason: In a chemical reaction atoms are merely rearranged, not created or destroyed, so mass is conserved (law of conservation of mass). Example: 2 H2 (4 g) + O2 (32 g) → 2 H2O (36 g) — reactant mass = product mass.
Caveats: measured mass can change in an open system if gases escape or enter, and mass–energy changes in nuclear reactions are not covered by ordinary chemical conservation.
Reason: In a chemical reaction atoms are merely rearranged, not created or destroyed, so mass is conserved (law of conservation of mass). Example: 2 H2 (4 g) + O2 (32 g) → 2 H2O (36 g) — reactant mass = product mass.
Caveats: measured mass can change in an open system if gases escape or enter, and mass–energy changes in nuclear reactions are not covered by ordinary chemical conservation.
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