30 pts. for correct answer and best explanation!

the following chemical equation shows the reaction of methane and oxygen to form carbon dioxide and water.

ch4 + 2o2 ⇒ co2 + h2o

balance the above reaction by writing the correct coefficient(s). you may do this by writing what coefficients should be added.
describe how a balanced equation demonstrates the law of conservation of mass.

Explanation:

Balancing the Hydrogen atoms on the right side,

Balancing the Oxygen atoms on the left side,

In a balanced equation, the product side and the reactant side must have the same mass of matter, since matter cannot be destroyed or created according to the law.

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).

it's all four options.