Masses and empirical formula - SC9

Question 1

How can relative formula mass be calculated?

Answer 1

by combining the relative atomic masses of the elements within compounds

Question 2

How can empirical formula be calculated when given its masses?

Answer 2

mass/relative formula mass (to find moles)–> moles/ smallest moles —> ratio of components is formed

Question 3

What’s the difference between empirical and molecular formulas?

Answer 3

empirical formula - is the simplest, whole number ratio of atoms of each element in a compound
molecular formula - the actual amount of atoms of each element present in a compound

Question 4

How can the empirical formula be found when given the molecular formula?

Answer 4

mol x mr = mass then same process as regular now mass has been found

Question 5

how can moles be found when given empirical formula and it’s relative formula mass

Answer 5

calculate molecular mass —> mr/ef mass —-> ans x ef

Question 6

what experiment determines empirical formula for a compound

Answer 6

Magnesium oxide experiment.