Moles
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The mole is the standard unit used to measure the amount of a substance. It represents 6.022x1023 particles, such as atoms or molecules. The mole allows chemists to conveniently express amounts of reactants and products in chemical reactions. Relative atomic mass (RAM) is a ratio that compares the average mass of an atom to 1/12 the mass of one atom of carbon-12. RAM values are often not whole numbers due to natural variations in atomic isotopes. Molecular atomic mass (MAM) is the total mass of all atoms in a molecule's formula.
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Moles
- 3. WHAT IS A MOLE??? The mole is the unit of measurement for amount of substance in the International System of Units (SI) The mole is widely used in chemistry as a convenient way to express amounts of reactants and products of chemical reactions.
- 4. WHY MOLE!!!! From previous knowledge you know that atom are very small and have very very small masses so it is not practical to measure them in KG or grams. For atom we use what is called moles . This is the amount of a chemical substance that contains atoms in 12 grams of carbon-12 (12C), the isotope of carbon with standard atomic weight 12 by definition. This number is expressed by the Avogadro constant, which has a value of approximately 6.022×1023 mol−1. The mole is an SI base unit, with the unit symbol mol.
- 5. What is Relative Atomic Mass For definition refer to book How much is the given element is greater than C-12 Basically you divide the mass of the given element by 1/12 the mass of carbon-12 which is 1
- 6. Continued Most of the elements R.A.M are not whole no. why????? give example?????
- 8. Do you relative abundance ??? how to calculate R.A.M
- 12. Short exercise Tell me the RAM of boron , beryllium &lithium 10 9 7 Tell me MAM acetic acid (CH3COOH) and nylon 6-6(C12H20N2O2 ) 60 224
- 13. Relative Formula Units Substances that are bonded ironically are measured in formula units according to the standard international scheme
- 15. Mini exercise Why ionic compounds are described by formula units ? Difference b/w RAM , MAM and RFM?
- 19. How many particles are there in one mole ? Avogadro's no.?
- 20. Avogadro’s number, number of atomic mass / molecular mass / formula units in one mole of any substance equal to 6.022 × 10 23
- 32. Difference b/w empirical and molecular formula ? Molecular formulas tell you how many atoms of each element are in a compound, and empirical formulas tell you the simplest or most reduced ratio of elements in a compound. If a compound's molecular formula cannot be reduced any more, then the empirical formula is the same as the molecular formula.
- 38. Molar gas volume