Amounts Of Substances Flashcards
1
Q
What is the amount of a substance measured in
A
Moles
2
Q
What is molar mass and it’s unit
A
The mass of one mole of a chemical(gmol-1)
3
Q
How to work out the amount of a substance in moles
A
Mass of substance(g)/molar mass(gmol-1)
4
Q
What is the Avogadro constant
A
The number of atoms, molecules or ions in one mole of a substance. The avogadro constant is 6.02 x 10 to the power of 23
5
Q
What is an empirical formula
A
It shows the simplest whole number ratio of the atoms of different elements in a compound
6
Q
What is the percentage composition of a compound
A
The percentage by mass of each of the elements in a sample of a compound
