What can be different between products and reactants in a balanced equation? a) The total mass of products and reactants

b) The total moles of each element present in the reactants and in the products.

c) The number of molecules in the reactants and in the products​​

b) The total moles of each element present in the reactants and in the products.

Explanation:

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In this case, since the law of conservation of mass is used to realize that the mass, atoms and molecules of all the species involved in a chemical reaction must be the same at both reactants and products, we can see that a and c stand for those that must be equal; thus, we infer that the moles can be different as they stand for the amount of substance which is related to the mass via molar masses. Therefore, the answer would be b) The total moles of each element present in the reactants and in the products.

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