L3 - Relative Mass + Moles Flashcards
1
Q
what is a mole?
A
The amount of atoms in 12g of the isotope carbon-12
2
Q
what is Avogadro’s constant?
A
molar mass /
mass on 1 atom/ion/compound
3
Q
What is the mole triangle?
A
mass (g)
moles (mol) | relative mass
4
Q
How do you work out relative atomic mass (Ar)?
A
Average mass of an element / 1/12 of the mass of carbon 12
5
Q
what is relative molecular mass (Mr)?
A
The sum of the relative atomic masses of all the atoms in a molecule
6
Q
Define Empirical formula
A
the simplest whole number ratio of atoms in a compound
