Question

What is the molar mass of calcium bromide?

Answer 1

Hint: Metals are placed at the left side of the periodic table and nonmetals are placed at the right side of the periodic table. calcium is an element that belongs to alkaline earth metals and bromine is an element that belongs to halogens. Both these metals combine to form a salt known as calcium bromide.

Complete Step By Step Answer:
The modern periodic table is the representation of elements arranged according to the order of atomic numbers in vertical columns and horizontal rows. The vertical columns were known as groups and the horizontal rows were known as periods.
The elements in the second group are known as alkaline earth metals. The elements in this group were beryllium, magnesium, calcium, strontium, barium, and radium.
Calcium is an element with atomic number $ 20 $ and has molar mass of $ 40gmo{l^{ - 1}} $ . It belongs to alkaline earth metals and can lose electrons as positive ions and is known as a cation.
Bromine is an element with atomic number $ 35 $ and has molar mass of $ 79.9gmo{l^{ - 1}} $ . It belongs to halogens and attracts electrons that exist as negative ions and are known as an anion.
As calcium bromide has the molecular formula of $ CaB{r_2} $ . The molar mass of this salt will be $ 35 + 2\left( {79.9} \right) = 199.89gmo{l^{ - 1}} $
Thus, the molar mass of calcium bromide is $ 199.89gmo{l^{ - 1}} $ .

Note:
The molecular formula consists of cation and anion. The electrons lost by a cation should be equal to the electrons gained by anion. As calcium loses two electrons and bromine can gain one electron. Two bromine atoms must react with one calcium atom.