Empirical and molecular formula Flashcards
What is empirical formula?
Simplest whole number ratio of atoms of each element present in a compound
How do you calculate empirical formula?
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
How do you use percentages to calculate moles?
Treat them as the mass
What is molecular formula?
Actual number of atoms in each element present in a molecule
What is the equation for molecular formula?
Molecular formula = molecular mass / empirical formula to find multiplier
How do you work out the molecular formula?
Work out the empirical formula then multiply this by the Mr of the compound