Reacting Masses, & Chemical Equation

Answer the questions in the

RED atoms!

1. Work out the Ar:

a) I

b) Fe

2. Work out the Mr:

a) water, H^2O

b) Magnesium Oxide, MgO^2

.3. Which has greater proportion of aluminium?

a) Al^2O^3

b) Na^3AlF^6

Mark Scheme

4. If the molar mass of chlorophyll is about 2500g. If each molecule contains two magnesium atoms, what percentage of the molecule is iron?

1) a) 127g

b) 56g

2) a)33g b) 56g

3) b) has the greatest proporiton

4)1.92%