Moles

How many atoms are in a mole?

6x10²³
How many atoms in half a mole?

3x10²³
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 dm³at room temp./ 24

OR

= number of cm³at 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

Author

gpiney

236790

Card Set

Moles

Description

Stuff to learn about moles

Updated

2013-09-24T19:50:42Z