Question

After a chemical reaction, the total mass of reactants and products _______.
(A) always increases
(B) always decreases
(C) does not change
(D) always increases or decreases

Answer 1

Hey ! ! !



The option of the above is C
The mass of reactants = Mass of products according to law of conversation of mass

H2+O2 ----------> H2O
2+16--------------->2×16
32------------------>32



Hope this helps you. please mark as brainliest answer.

Answer 2

Dear Rob,

● Answer - (C) does not change
After a chemical reaction, the total mass of reactants and products *does not change*.

● Law of conservation of mass -
- During a chemical reaction, total mass of reactants & products always remains conserved.
- Also total no of atoms in reactants & products is conserved.
- For example, in the reaction 2H2 + O2 -> 2H2O, 4 H-atoms & 2 O-atoms are involved.

Hope this helped you. Thanks for asking..