Question

What is mass conservation?

Answer 1

The principle that `"garbage in equals garbage out...."` Mass is KNOWN to be conserved in EVERY chemical reaction..

Explanation:

And this is why educators insist that chemical equations must be balanced with respect to mass and charge... If they ain't then the equation CANNOT represent chemical reality....

`(("Reactants"), (color(red)"A given mass"))stackrel(" ")rarr(("Products"), (color(red)"The same mass"))`

See here and links for the same...and here, and elsewhere...