Question

How to calculate molecular formula if only percentage composition is given?​

Answer 1

hey mate.....

u can use emperical formula method....


answer in attachment

Answer 2

The molecular formula of a compound denotes the actual number of atoms of different elements present in one molecule of the compound .

Now, first understand what empirical formula is .

The empirical formula of a compound is the simplest formula which gives the simplest ratio in whole numbers of atoms of different elements present in one molecule of the compound .

Percentage composition of a compound is the percentage by weight of each element present in it .

Steps to find the molecular formula of a compound:-

1. Calculate it's empirical weight from its empirical formula.

2 . Divide it's molecular weight by empirical weight ( n).

3. Multiply the empirical formula with n.

Now,

Molecular formula = Empirical formula× n

Check out the example in the attachment: