Question

write a balanced chemical equation for each
a) when aluminum metal reacts with iron (iii) oxide, it forms aluminum oxide and iron
b) sodium phosphate reacts with calcium chloride to produce sodium chloride and calcium phosphate
c) a sample of octane (c₈h₁₈) combusts in oxygen to produce carbon dioxide and water

Explanation:

Step1: Write the unbalanced equation for part a

Al + Fe₂O₃ → Al₂O₃ + Fe

Step2: Balance the equation for part a

$$2Al + Fe₂O₃ = Al₂O₃ + 2Fe$$

Step3: Write the unbalanced equation for part b

Na₃PO₄ + CaCl₂ → NaCl + Ca₃(PO₄)₂

Step4: Balance the equation for part b

$$2Na₃PO₄ + 3CaCl₂ = 6NaCl + Ca₃(PO₄)₂$$

Step5: Write the unbalanced equation for part c

C₈H₁₈ + O₂ → CO₂ + H₂O

Step6: Balance the equation for part c

$$2C₈H₁₈ + 25O₂ = 16CO₂ + 18H₂O$$

Answer:

a) \(2Al + Fe₂O₃ = Al₂O₃ + 2Fe\)
b) \(2Na₃PO₄ + 3CaCl₂ = 6NaCl + Ca₃(PO₄)₂\)
c) \(2C₈H₁₈ + 25O₂ = 16CO₂ + 18H₂O\)