Unit 1-Area of Study 2

Question 1

What is the mole equation?

Answer 1

n=m/M

Question 2

Which three steps must be taken in order to change from compound percentage to empirical formula?

Answer 2

1) Divide each percentage by molar mass to determine number of moles
2) Divide number of moles by lowest number
* * must end up with semi-rational numbers **
3) Multiply up to whole numbers

Question 3

Which three steps must be taken in order to determine the mass of a compound in a reaction?

Answer 3

1) Determine number of moles in given sample
2) Work out Stochiometric ratio
3) Multiply reactant’s ratio by n=m/M to determine mass of reactant compound

Question 4

What is the concentration equation?

Answer 4

n = v(mL) * M / 1000

=c*v