calculations Flashcards
1
Q
what is the definition of relative atomic mass?
A
a average mass of one atom of an element compared to one twelfth of the mass of an atom of carbon 12
2
Q
how to calculate relative atomic mass?
A
sum of mass x abundance of each isotope /
total abundance
3
Q
what is the percentage of percentage abundance?
A
100%
4
Q
is relative abundance 100%?
A
no it isn’t
5
Q
what is a mole?
A
number of atoms in 12g of carbon 12
6
Q
what is avogadro constant?
A
6.022 x 10²³
7
Q
how to write the empirical formula when doing a reacting masses calculations?
A
work out ratio
8
Q
how to find molecular formula
A
- find empirical formula
- divide molecular mass by empirical mass
- multiply empirical formula by that amount
