calculations in chemistry Flashcards
1
Q
relative atomic mass
A
weighted average mass of an elements isotopes compared to an atom of carbon-12
2
Q
R.A.M formula
A
(percentage x atomic mass) + (percentage x atomic mass) / 100
3
Q
relative molecular mass
A
sum of all the masses of atoms in a molecule compared to an atom of carbon-12
4
Q
percentage composition
A
percentage of total mass of the compound that is due to that component
5
Q
laws of chemistry
A
1) elements always react in the same ratios, to form a given compound
2) the total mass does not change during a chemical reaction
6
Q
empirical formula
A
simplest whole number ratio of atoms or ions
7
Q
molecular formula
A
? x empirical formula
? = molecular mass of a compound/ molecular mass of emperical formula
8
Q
avogadro’s number
A
6.02 x 10^23
9
Q
mole formula
A
mass/molecular mass (n=mM
