The reaction between calcium oxide (CaO) and stearic acid (CH₃(CH₂)₁₆COOH) is a neutralization reaction, forming calcium stearate and water.

Here's the balanced chemical equation:

CaO + 2 CH₃(CH₂)₁₆COOH → (CH₃(CH₂)₁₆COO)₂Ca + H₂O

Explanation:

* CaO: Calcium oxide, a basic oxide.

* CH₃(CH₂)₁₆COOH: Stearic acid, a long-chain fatty acid.

* (CH₃(CH₂)₁₆COO)₂Ca: Calcium stearate, a salt of stearic acid.

* H₂O: Water, formed as a byproduct.

Balancing the Equation:

* Ca: 1 on each side.

* O: 3 on each side.

* C: 18 on each side.

* H: 36 on each side.

Therefore, the equation is balanced.