Question

The molecular formula of copper(II) bromide is:
A. $CuBr$
B. $CuB{{r}_{3}}$
C. $CuB{{r}_{2}}$
D. $C{{u}_{2}}B{{r}_{3}}$

Answer 1

Hint: At the earliest stage chemical formulas are obtained of any molecule by determining the masses of all the elements that are combined to form a molecule after that two important types of formulas in chemistry are comes which are known as molecular formula and empirical formula.

Complete answer:
The molecular formula is defined as the formula derived from molecules and is representative of the total number of individual atoms present in a molecule of a compound. A molecular formula generally uses a subscript which reports the actual number of each type of atom in a molecule of the compound.
Molecular formulas are also associated with gram molecular masses which are simple whole number multiples by the corresponding empirical formula mass where empirical formula of a compound gives the simplest ratio of the number of different atoms present, whereas the molecular formula gives the actual number of each different atom present in a molecule. If the formula is simplified then it is an empirical formula. The molecular formula is commonly used and is a multiple of the empirical formula. The general statement is represented by
$Molecular\ \text{formula = n }\times \text{ Empirical formula}$
Molecular formula of copper bromide is $CuBr$which represents copper and bromide ions in 1:1.

Thus option A is the correct answer.

Note:
The empirical formula can also be known by the name simplest formula and can be defined as the simplest formula of a compound which is defined as the ratio of subscripts of the smallest possible whole number of the elements present in the formula.