Quantities used in chemistry Flashcards
1
Q
What do moles measure?
A
Number of particles in a substance
2
Q
Mole = ?
A
Mole = Mass / Mr
3
Q
What is Ar?
A
Mass in one mole of an element. (Atomic mass)
4
Q
What is Mr?
A
Sum of all the masses in a compound. (Relative formula mass)
5
Q
What is empirical formula?
A
Ratio between elements in a chemical compound.
6
Q
Empirical formula calculation?
A
Divide both masses by Ar and find the ratio.
7
Q
Number of moles = ?
A
Number of moles = Molarity x Volume
8
Q
percentage yield = ?
A
actual/expected (x100)
