Question

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Answer 1

No one can. What are you studying? Which chapter? What level? You need to read your textbook for an answer to this.

Answer 2

For a basic idea about a chemical reaction, u may consider the following
Reagent A + Reagent B +... ---> Product C + Product D

And here, ENERGY and MASS must be conserved.
I hope you know about, conservation of mass and energy, it means the total energy/mass should be the same on both sides of the equation.

Answer 3

ok thanks

Answer 4

you are welcome