Some Basic Concepts Of Chemistry


 

Some Basic Concepts Of Chemistry logoSubject: Chemistry    Exam: WBJEEM Medical

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Important Points

Atomicity is the number of atoms of an element present in one molecule of that element. They can be monatomic (He),diatomic (H2),triatomic (O3) and polyatomic (S8).
Relative molecular mass shows the number of times a molecule is denser than a hydrogen atom or one amu. It is expressed as the ratio of the mass of a molecule of a substance to the mass of one amu (or to one atom of hydrogen).
Relative molecular mass= Mass of one molecule of a substance/one amu.
Empirical formula of a compound is a formula that shows the simplest whole number ratio between the atoms of the elements in the compound.
Molar volume is the volume occupied by one mole of any gas at a definite pressure and temperature. It is denoted by Vm. Molar volume of the substance depends on temperature and pressure. The unit of molar volume is litre per mol or milliliter per mol.
 
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