The Mole Concept, Chemical Formula and Equation

Sometime, you may be given the mass of a substance, and asked to find the number of particles (or vice versa). To solve the problem, we must find the number of mole of the substance then only we can find the number of particles (or mass of the substance). Example: How many molecules are there … Read more

Molar Mass The mass of one mole of atoms is its relative atomic mass in grams, and is called a molar mass. A Molar mass is the mass of a substance containing the Avogadro Constant of particles. Element Relative atomic mass Mass of 1 mol of particle Molar Mass Hydrogen 1 1 g 1 g … Read more

Number of Mole of Atoms and Number of Mole of Molecules All molecules contain more than one atom. For example, in a carbon dioxide molecule (CO2), there are 3 atoms – 1 carbon atom and 2 oxygen atoms. Therefore, in 5 carbon dioxide molecules, there will be 15 atoms  – 5 carbon atom and 10 oxygen atoms. … Read more

Number of Mole and Number of Particles We have just learn that, mole is a quantity, and it is equal to 6.02 x 1023. The number 6.02 x 1023 is called the Avogadro constant. Therefore, if we are given the number of mole of substance, and asked to find the number of particles (atoms, molecules or ions) in … Read more

A mole is defined as the amount of substance which contains the Avogadro Number of particles. The Avogadro Number (or Avogadro Constant) is defined as the number of atoms in 12 g of the carbon-12 isotope, which is equal to 6.02 x 1023. 1 mole = 6.02 x 1023 Example:1 mol of atoms = 6.02 x … Read more

The relative molecular mass (Mr) of an element is the average mass of one molecule of the element/compound when compared with the mass of an atom of carbon-12, which taken as 12 units. The relative molecular mass of a molecule is equal to the sum of the relative atomic mass of all the atoms in … Read more

https://youtu.be/IjtBbEkse1g?list=PLP7MKjUAZ-wuAQxBnhzg24xQxK7QV-imQ Relative Mass The relative mass of an object is the comparison of the mass of the object to the mass of a standard object. Relative Atomic Mass Relative Atomic Mass The relative atomic mass (Ar) of an element is the average mass of one atom of the element when compared with 1/12 of the … Read more

Revision Notes 3.1 Relative Mass3.2 Concept of Mole3.3 Number of Mole and Mass3.4 Number of Mole and Volume of Gas3.5 Chemical Formulae3.6 Formula of Ionic Compounds and Molecules3.7 Chemical Equations Videos Relative Atomic Mass Relative Molecular Mass Concept of Mole Mole and Number of Particles Molar Mass Chemical Formulae Finding Empirical Formula Finding Molecular Formula