Moles

Question 1

moles of an element equation

Answer 1

moles of an element = mass/R.A.M

Question 2

what is a mole?

Answer 2

is a particular measure of an amount of substance

Question 3

moles of a compound equation

Answer 3

mass/R.M.M

Question 4

moles of a gas equation

Answer 4

volume in cm3/24 000 or volume in dm3/24

Question 5

moles in solution equation

Answer 5

molarity (moldm-3) x volume (cm3) / 1000

Question 6

how do you work out the empirical formula if given a mass or percentage?

Answer 6

divide by the R.A.M then divide by the smallest to give whole numbers

Question 7

how do you work out the molecular formula?

Answer 7

you work out the empirical formula R.A.M and divide by the R.A.M of molecular formula and multiply by factor

Question 8

what is the equation for calculating percentage yield?

Answer 8

percentage yield = amount of product produced / max amount of product possible x 100

Question 9

volumetric / titration calculation

Answer 9

moles = molarity x volume/1000