Skip to main content

Mole

 A mole is defined as the amount(mass) of a substance that contains 6.022 × 10²³number of particles (atoms, molecules or formula units). It establishes a link between mass of a substance and number of particles as shown in summary of molar calculations.

•It is abbreviated as 'mol'.

Mass of a substance is either one of the following: atomic mass, molecular mass or formula mass. These masses are expressed in atomic mass units (amu). But when these masses are expressed in grams, they are called as molar masses.

 •Scientists have agreed that Avogadro's number of particles are present in one molar mass of a substance. Thus, quantitative definition of mole is the atomic mass, molecular mass or formula mass of a substance expressed in grams is called mole.

For example:

Atomic mass of carbon expressed as 12 g = 1 mol of carbon

Molecular mass of H2O expressed as 18 g = 1 mol of water

Molecular mass of H2SO4 expressed as 98 g = 1 mol of H2SO4

Formula mass of NaCl expressed as 58.5 g = 1 mol of NaCl

 •The relationship between mole and mass can be expressed as:


Or,

 Mass of substance (g) = number of moles x molar mass

Summary showing a relationship between a substance and a mole.



Comments

Post a Comment

Popular posts from this blog

Branches of chemistry part 3

Hello readers!  We have already discussed main branches of chemistry. Today we will discuss further.  Agro Chemistry: It examines chemical processes important to agriculture. It includes pesticides, herbicides, fungicides and seed treatment.  Forensic Chemistry: It can be defined as practice of application of our knowledge in field of chemistry to solve crimes. Most common methods used are spectroscopy and chromatography.  Astro Chemistry: It is the study of chemical reaction in space. This discipline is an overlap of chemistry and astronomy.  Coordination Chemistry: It is the study of coordination complexes, consists of central metal atoms mostly and surrounded by ligands.  Medicinal Chemistry: It is the intersection of chemistry especially synthetic organic chemistry. Medicinal chemistry designs, synthesized and studies drugs and other therapeutic agents.  Geo Chemistry: The study of chemical composition of rocks, minerals, atmosphere of Earth and ot...
15 comments
Read more

Oxygen Cycle

It involves the inter- change of oxygen between the elemental form of gaseous O2, contained in a huge reservoir in the atmosphere, and chemically bound O in CO2, H2O, minerals, and organic matter. It is strongly tied with other elemental cycles, particularly the carbon cycle. Elemental oxygen becomes chemically bound by various energy-yielding processes, particularly combustion and metabolic processes in organisms. It is released in photosynthesis. This element readily combines with and oxidizes other species such as carbon in the process of aerobic respiration, or carbon and hydrogen in the combustion of fossil fuels such as methane: CH4 +  2O2    →   CO2    +  2H2O Elemental oxygen also oxidizes inorganic substances such as iron(II) in minerals: 4FeO4   +   O2   →    2Fe3O3 A particularly important aspect of the oxygen cycle is stratospheric ozone O3. A relatively small concentration of ozone in the strato...
Post a Comment
Read more

Introduction

 Hello everyone! I hope you all will be fine. Myself Maheen. And I'm masters in CHEMISTRY. Chemistry is not only a subject for me but it's passion for me. It's really interesting for me to study this subject. Some people take it difficult but I think it's not difficult. Actually they are not made to study chemistry. If you love a field it becomes easy for you. By the way if you keep in touch with me I will tell you a lot about my subject, my experience. 
6 comments
Read more