What is percentage composition and molecular formula?

Asked by satyapaldpr | 16th May, 2015, 06:58: PM

Expert Answer:

Percent Composition:

It is the percent by mass of each element present in a compound.


 

Take  example of water.

One mole of water is 18.0152 gms

In water, there are two moles of hydrogen atoms = 2 x 1.008 = 2.016gms

It also has one oxygen atom = 1 x 16 = 16gms

To obtain the percentage of hydrogen

% of hydrogen = 2.016/18.015 x 100 = 11.19%

% of oxygen  = 16/18 .015x 100 =88.81%

Molecular formula:

Molecular formula shows the exact number of different types of atoms present in a molecule of a compound.

Molecular formula = n x Empirical formula 

Percent Composition:

It is the percent by mass of each element present in a compound.

Take  example of water.

One mole of water is 18.0152 gms

In water, there are two moles of hydrogen atoms = 2 x 1.008 = 2.016gms

It also has one oxygen atom = 1 x 16 = 16gms

To obtain the percentage of hydrogen

% of hydrogen = 2.016/18.015 x 100 = 11.19%

% of oxygen  = 16/18 .015x 100 =88.81%

Molecular formula:

Molecular formula shows the exact number of different types of atoms present in a molecule of a compound.

Molecular formula = n x Empirical formula

Answered by Vaibhav Chavan | 17th May, 2015, 03:22: PM