Calculate the Masses of Products/Reactants for the following Reactions

1. What mass of water is produced by burning 16g of hydrogen in an excess of oxygen

step 1 equation 2H₂ + O₂ 2H₂O

step 2 work out M_r 2(2x1) + (2x16) 2( (2x1) + 16)

step 3 check totals 4 + 32 = 36

Step 4 apply ratio if 4g of H₂ produces 36g of H₂O

then 1g of H₂ produces 36/4 g of H₂O

then 16g of H₂ produces 16x36/4 =144g of H₂O

2. What mass of oxygen must be reacted to produce 288g of water?

3. How much aluminium oxide is needed to produce 2160 tonnes of aluminium

2Al₂O₃ 4Al + 3O₂

4. What mass of iron sulphide is produced when 64g of sulphur reacts with iron?

How much iron needs to be reacted with sulphur to produce 352g of iron sulphide?