Empirical and molecular formula Flashcards
1
Q
What is empirical formula?
A
Simplest whole number ratio of atoms of each element present in a compound
2
Q
How do you calculate empirical formula?
A
Divide the mass by atomic mass tot calculate the moles. Then, divide the moles by the mallets number of moles for each element to give you the ratio
3
Q
How do you use percentages to calculate moles?
A
Treat them as the mass
4
Q
What is molecular formula?
A
Actual number of atoms in each element present in a molecule
5
Q
What is the equation for molecular formula?
A
Molecular formula = molecular mass / empirical formula to find multiplier
6
Q
How do you work out the molecular formula?
A
Work out the empirical formula then multiply this by the Mr of the compound
