Chemistry Tuition Singapore – The Mole Important Concepts

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Chemistry Tuition Singapore – The Mole Important Concepts

1. The relative atomic mass (A_r) of an element is the number of times the mass of one atom of the element is greater than 1/12 of the mass of one carbon-12 atom.
2. The relative molecular mass (M_e) of an element or a compound is the number of times the mass of its molecule is greater than 1/12 of the mass of one carbon-12 atom.
3. One mole is the amount of substance that contains the same number of particles as the number of atoms in 12.0 g of carbon-12.
4. The molar mass of a substance is the mass of one mole of the substance in grams.
5. The empirical formula of a compound is the formula that shows the simplest ratio of elements in the compound.
6. The molecular formula of an element or a compound is the formula that shows the exact number of atoms of each element in a molecule.
7. The molar volume of a gas is the volume of one mole of the gas.
8. Avogadro’s Law states that equal volumes of all gases, under the same conditions of temperature and pressure, contain the same number of molecules.

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