Paper 1 equations

Question 1

percentage mass of an element in a compound

Answer 1

Ar x number of atoms of that element / Mr of the compound

Question 2

Mass

Answer 2

Number of moles x Mr

Question 3

Volume of gas

Answer 3

(Mass of gas / Mr of gas) X 24

Question 4

concentration =

Answer 4

mass of solute / volume of solvent

or

number of moles of solute / volume of solute

Question 5

number of moles

Answer 5

concentration x volume

Question 6

atom economy

Answer 6

(Relative formula mass of desired products / relative formula mass of all reactants) x100

Question 7

percentage yield

Answer 7

(mass of product actually made / maximum theoretical mass of product) x 100