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How many atoms are in a mole?
How many atoms in half a mole?
How do you work out the number of moles of an element?
- no. of moles = mass of element/ relative atomic mass of element
How do you work out the mass of a mole or fraction of a mole of an element?
mass=no. if moles x relative atomic mass
How do you work out the number of moles in a compound?
no. of moles = mass/relative molecular mass
What is Avogadro's law ?
At the same temperature and pressure equal volumes of all gases contain equal numbers of molecules.
How do you work out the number of moles of a gas?
no. of moles = number of dm3 at room temp./ 24
= number of cm3 at room temp./ 24000
What is the triangle used for working number of moles, concentration and volume?
How do you calculate the weighted mean mass?
- Isotope number x percentage (for all isotopes in calculation)
- Divide by 100
- Round to 1 d.p.
What is another (easier) way of saying weighted mean mass?
Relative atomic mass
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