Question

Question #07b70

Answer 1

See below.

Explanation:

Mass of substance `"= 184.1 g"`
It contains 2 Br

`therefore` mass of `"Br" = 79.9 xx 2 = "159.8 g"`

It contains one other atom, X

`therefore` mass of `"X" = 184.1-"159.8 g" = "24.3 g"`

In the periodic table, the element with a mass of `"24.3 g"` is Mg. Thus X is Mg.

Hope this helps :)