1.1. This question is about the reactions of metals and metal oxides.

9.6 g of magnesium is burned in oxygen to form magnesium oxide.

2Mg + O₂ → 2MgO 

How many moles are in 9.6 g of magnesium?

Relative atomic mass (A_r): Mg = 24

Use the equation:

  $Moles=\frac{mass}{{M}_{r}}$

1.2. How many moles of magnesium oxide are produced when 9.6 g of magnesium is burned in oxygen?

1.3. What mass of magnesium oxide is produced when 9.6 g of magnesium is burned in oxygen?

Use the equation:

Mass = moles x M_r 

1.4. What mass of hydrogen is needed to react with 3.18 g of copper oxide?

CuO +  H₂  →  Cu  +  H₂O

Relative formula mass (M_r): CuO = 79.5

1.5. Potassium is burned in oxygen to form potassium oxide.

4K + O₂ → 2K₂O

What mass of potassium oxide is formed when 1.95 g of potassium is burned in oxygen?