An element x has a dibrom ide with the empirical formula xbr2 and a dichloride with the empirical formula xci2. the dibromide is completely converted to the dichloride when it is heated in a stream of chlorine according to the reaction $$xbr2 + cl2 → xci2 + br2$$ when 1.500 g xbr2 is treated, 0.890 g xci2 results. (a) calculate the atomic mass of the element x. (b) by reference to a list of the atomic masses of the elements, identify the element x.

58.85 g/mol is the atomic mass of the element X.

The element X is cobalt.

Explanation:

Moles of mol

According to reaction, 1 mole of gives 1 mole of . then mol of [tex[CBr_2[/tex] will give:

mol=\frac{1.500 g}{M}[/tex] mol[/tex]  of

Mass of moles of =0.890 g (given)

Atomic mass of element X  =m

M=

M'=

m = 58.806 g/mol

58.56 g/mol is the atomic mass of the element X.

m = 58.806 g/mol  ≈ 58.93 g/mol atomic mass of cobalt

The element X is cobalt.

the answer is c.the valence of the atoms combine .