The accurate relative isotopic masses and relative abundances of the isotopes in a sample of bromine are shown below.
Isotope
79Br
81BT
Relative isotopic mass
78.9183361
80.9162896
Relative abundance (%)
50.69
49.31
i.
What is the relative atomic mass of bromine in this sample?
Give your answer to three decimal places.

ill try to . no promises tho.

explanation:

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-

c (diamond),

sio2 (quartz)