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In a chemical reaction, mass is conserved. This means that

a.
The mass of the products is always twice the mass of the reactants.


b.
The mass of the products stays the same during a chemical reaction


c.
The mass of the reactants stays the same during a chemical reaction


d.
The type and number of atoms in the reactants equals the type and number of atoms in the products

Answer :

d. the mass and number of atoms and the elements will always and must be equal on both sides of the equation, mass can not be destroyed, only conserved