Question

The relative formula mass (M) of XCO, is 84

Relative atomic masses (A.): C = 12 O = 16
Calculate the relative atomic mass (A) of X.

Answer 1

x = 56

relative atomic mass is 58.933

Step-by-step 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.