M(Me)-5,4гр. m(MeBr2)-20гр. Me-?

Question

M(Me)-5,4гр. m(MeBr2)-20гр. Me-?

Answer 1

5.4g         20g
Me+Br2=MeBr2
xg           x+160g
5.4(x+160)=20x
5.4x+864=20x
864=20x-5.4x
864=14.6x
x=59
Co-кобальт
CoBr2