Structure 1.4
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Mole
A SI unit of amount of substance. One mole contains exactly Avogadro’s constant of elementary entities.
How many grams of hydrogen contains 6.02x10^23 atoms?
1.00g
What are the units of relative atomic mass?
it has no units as it is relative
Units of Atomic mass of an element
g mol-1
Molar mass
the mass of one mole of any substance. Same as molecular mass (for molecules) and formula mass (for ionic compounds.
Empirical formula
The simplest whole number ratio of atoms of each element in a particle of the substance.
Molecular formula
Shows the actual number of atoms of each element in a molecule of the substance.
Molecular mass
Molar mass for molecules
Formula Mass
Molar mass for ionic compounds
What does a 1.00 molar solution contain?
One mole of solute dissolved in a solvent to give a total volume of 1.00 dm^3 of solution.
Concentration Units
mol dm^-3, this can be expressed by square brackets around the solute
How is gas volume determined?
Only by the number of particles, the temp and pressure. The chemical nature of the gas is irrelevant.
Avogadro’s Law
Equal volumes of all gases, when measured at the same temperature and pressure, contain an equal number of particles.