NCERT Chemistry class 11 - Online Notes : Stoichiometry Here, we will discuss Stoichiometry from unit 1 of CBSE Class 11 Chemistry . What is stoichiometry? The relationship between the relative quantities of substances taking part in a chemical reaction or forming compounds, typically a ratio of whole integers. Mole: The mole is the SI unit for the amount of substance. In short, it is written as “mol”. Mole is defined as the amount of a substance that contains the same number of entities (electrons, atoms, ions, or molecules) as the number of atoms in 12 grams of carbon-12 ( 12 C). This is given by Avogadro’s number , in honor of an Italian physicist Amedeo Avogadro. Avogadro number gives the number of units in one mole of any substance, which is equal to 6.0221×10 23 .The units may be electrons, atoms, ions or molecules depending on the nature of the substance and the reaction it undergoes. This means that one mole contains 6.023×10 23 entities/units. The importan
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