Mole Concept
Kerala Board · Class 12 · Chemistry
Quick revision notes for Mole Concept — Kerala Board Class 12 Chemistry. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
SI Units and Measurement Fundamentals
- SI units provide a universal measurement system adopted worldwide in 1960
- Seven base SI units form the foundation: meter (m), kilogram (kg), second (s), ampere (A), kelvin (K), candela (cd), and mole (mol)
- Prefixes like kilo (10³), centi (10⁻²), milli (10⁻³), nano (10⁻⁹) help express large and small quantities
The Mole - Definition and Significance
- Mole is the SI base unit for amount of substance, symbol 'mol'
- One mole contains exactly 6.022 × 10²³ elementary entities
- Elementary entities can be atoms, molecules, ions, or formula units depending on the substance
Avogadro's Constant and Its Applications
- Avogadro's constant (Nₐ) = 6.022 × 10²³ mol⁻¹
- Named after Amedeo Avogadro, though he never calculated this number
- Represents the number of entities in one mole of any substance
Atomic Mass Scale and Relative Masses
- Atomic mass unit (amu) = 1/12 mass of one carbon-12 atom
- Also called unified atomic mass unit (u) or dalton (Da)
- Relative atomic mass is dimensionless, atomic mass has unit amu
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Sources & Official References
- Kerala Board of Public Examinations — keralapareekshabhavan.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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