Equations

Question 1

Moles (solids)

Answer 1

n=m/Mr

Question 2

Moles (solutions)

Answer 2

n=CxV

Question 3

Moles (gases)

Answer 3

n=V/24 (dm3)

Question 4

Relative atomic mass of isotopes

Answer 4

(% abundance x mass) + (…)/100

Question 5

Steps to deduce molecular formula

Answer 5

1) Write down empirical formula
2) Calculate Mr of empirical formula
3) Mr of empirical formula/Mr of compound
4) Multiply by the Mr of empirical formula by this answer

Question 6

steps to finding x mass

Answer 6

1) Look at the balanced equation and highlight the numbers
2) Work out the Mr of the reactant and the product
3) Find how many moles there are of the substance you know the mass of
4) Use the balanced equation to find out how many moles of the other substance there will be
5) Use this to calculate the mass]

Question 7

Volume of gas

Answer 7

Volume (dm3) = moles of gas x 24