Relative atomic and molecular masses, the avogadro constant, and the mole Flashcards
Which isotope is used as the baseline for measuring relative atomic mass?
Carbon- 12
What is the definition of relative atomic mass (Ar)?
The weighted average mass of an atom of an element, taking into account its naturally occurring isotopes, relative to 1/12 the relative atomic mass of carbon- 12
How do you work out relative atomic mass?
Ar= average mass of one atom of an element/ 1/12 mass of one atom of 12C
What is the definition of relative molecular mass?
the mass of that molecule compared to 1/12 the relative atomic ,ass of an atom of carbon- 12
How do you work out relative molecular mass?
Mr= average mass of one molecule/ 1/12 mass of one atom of 12C
What is the relative formula mass?
It is used for ionic compounds because they do not exist as molecules. However it has the same symbol (Mr)`
What is the Avogadro constant?
6.022 x 1023
What is the Avogadro number?
The number of atoms in 12g of carbon- 12
If a substance contains 6.022 x 1023 particles what is it known as?
a mole
What is the symbol for moles?
n
What is the symbol for mass?
m
What is the unit for mass?
Grams (g)
A video I found which may help to explain
