Question

what is the requirement for writing molecular formula of different compounds how are the molecular formula of the compound written

Answer 1

you can write the molecular formula of compound by using criss cross rule

Answer 2

we write chemical formula to count the number of each atom given.
Steps to write a chemical formula

Step 1: First, you have to decide the type of the bond.

If the prefixes are used, then it is a covalent bond. In case there are no prefixes, it is an ionic bond. After that is decided move to Step number 2.

Step 2: Now, write down the symbol of the polyatomic ion or the element.

Step 3: Now, if the prefix was used, you’ll have to add a subscript. You’ll also have to add a subscript in order to balance the charge.
Solved Example For You

Q. Write the chemical formulae for

HexaneSodium Chloride

Ans. C6H14 – this has 6 atoms of carbon and 14 atoms of Hydrogen and is collectively called Hexane. NaCl- also known as Sodium Chloride or common salt, this formula has a single atom of Sodium and a single atom of Chloride. Always remember that in places where there is no subscript, like in the example above, the value of atom is presumed to be 1.