Quantative Chemistry Flashcards
1
Q
What is the symbol for the relative formula mass
A
Mr
2
Q
What is the relative formula mass
A
The sum of the relative atomic masses of all the atoms in the formula
3
Q
What is the Avogadro constant
A
The number ir atoms, molecules or ions in one mole of a substance
4
Q
What is the value of the Avogadro constant
A
6.02x10 to the power of 23
5
Q
How do you work out the mass of a substance
A
Molar mass (g/mol) x Amount of moles (mol)
6
Q
How do you find the relative formula mass of a substance
A
Mass/ number of moles
7
Q
What is the empirical formula
A
The simplest whole number, mole ratio of atoms in a compound
8
Q
How do you calculate the empirical formula
A
Convert the masses of each element in the compound into moles and then divide through by the smallest number to get the smallest ratio
