Element "z" has 2 naturally occurring isotopes with the following masses and natural abundances:

a. z-45 44.8776 amu 32.88%
b. z-47 46.9443 amu 67.12%
c. calculate the atomic mass of z.

the atomic Mass of Z is 46.26

Explanation:Please see attachment for explanation

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.