Formulae, equations & amount of substance
- Created by: Shannon
- Created on: 05-03-14 16:52
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- Formulae, equations & amount of substance
- Amount of substance
- n=cxV
- n=m/M
- Molar volumes of gases
- n=V/Vm
- Vm = 24 dm3mol-1
- Standard temperature and pressure are used to compare molar volumes.
- 298 K
- 1 atmosphere pressure
- A mole
- The amount of substance that contains the same number of stated elementary units as there are atoms in 12 g of carbon-12
- This is also called the Avogadro constant
- 6.022x1023 mol-1
- This is also called the Avogadro constant
- The amount of substance that contains the same number of stated elementary units as there are atoms in 12 g of carbon-12
- Empirical formula
- The simplest whole number ratio of the number of atoms of each element present in a compound
- Percentage yield
- Practically, achieving 100% yield is very rare
- Some product is left behind on the apparatus
- Volatile products may evaporate
- Human error is weighing/decanting etc
- mass of product/theoretical mass x100
- Practically, achieving 100% yield is very rare
- Atom economy
- The number of atoms that end up in the desired product
- Mass of atoms in desired product/Maa of atoms in reactant x100
- Molecular formula
- The molecular formula provides the number of each atom that makes up a molecule
- Defintions
- Ions
- An atom or molecule with a net electic charge to the loss or gain of electrons
- Atom
- An atom consists of neutrons & protons in a nucleus and electrons orbiting the nucleus
- Element
- An element consists of one type of atom - they are defined by the number of protons they possess
- Ions
- Amount of substance
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