Chemistry, 06.12.2019 12:31 samiyahbass

Which of the following must be the same before and after a chemical reaction?
1. the total mass of the reactants and total mass of the products.
2. the number of molecules of each substance involved in the chemical reaction.
3. the number of atoms of each element involved in the chemical reaction.

a. 1,2,3 b. 1,3 c. 2,3 d.3

pls chose a, b,c or d pls send explaination if possible.

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Which of the following must be the same before and after a chemical reaction?
1. the total ma...

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