The atomic mass of an element is the weighted average of the atomic masses of
A
the least abundant isotopes of the element
B.
the naturally occurring isotopes of the element
C.
the artificially produced isotopes of the element
D.
the natural and artificial isotopes of the element
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Explanation:

If

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.

i'm pretty sure it is letter c.) car