# Moles

The flashcards below were created by user gpiney on FreezingBlue Flashcards.

1. How many atoms are in a mole?
6x1023
2. How many atoms in half a mole?
3x1023
3. How do you work out the number of moles of an element?
• no. of moles = mass of element/ relative atomic mass of element
4. 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
5. How do you work out the number of moles in a compound?
no. of moles = mass/relative molecular mass
6. What is Avogadro's law ?
At the same temperature and pressure equal volumes of all gases contain equal numbers of molecules.
7. How do you work out the number of moles of a gas?
no. of moles = number of dmat room temp./ 24

OR

= number of cmat room temp./ 24000
8. What is the triangle used for working number of moles, concentration and volume?
9. 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.
10. What is another (easier) way of saying weighted mean mass?
Relative atomic mass
 Author: gpiney ID: 236790 Card Set: Moles Updated: 2013-09-24 19:50:42 Tags: Moles Weighted mean mass moles gas triangle Folders: Description: Stuff to learn about moles Show Answers: