Answer:
x = 56
relative atomic mass is 58.933
Explanation:
finding the relative molecular mass of x first...
x + (C ×1) + (O ×1) =84
x + (12 ×1) + ( 16 × 1) =84
x + 12 + 16 =84
collect like terms
x = 84-12+16
x= 56
now...
half of 56...
56÷2 =27
and 27 is the atomic number of cobalt...
so relative atomic mass of cobalt is 58.933.
