S1.4

Question 1

equation for mol

Answer 1

Mass/molar mass (mr)
OR
volume x concentration

Question 2

% composition by mass

Answer 2

mr of X / mr of compound

x 100

Question 3

How to find molecular formula

Answer 3

1. find mr of empirical formula
2. do mass / mr to get the mol
3. times mol by empirical formula

Question 4

how to find concentration

Answer 4

mass / volume
OR
mol / volume
OR
mass of solute / mass of solution
x 10^6

Question 5

how to find limiting reactant

Answer 5

1. find mol of each reactant
2. divide by the coefficient in front
3. smaller one is limiting reactant

Question 6

how to find limiting reactant at constant temp and pressure

Answer 6

volume / coefficient for each reactant

Question 7

how to do back titration

Answer 7

1. find initial mol of known reactant
2. find excess mol of known reactant from other equation
3. to find reacted mol do: initial - excess
4. using reacted mol find mol of the other reactant
5. find mass of other reactant by doing mol x mr