Distinguish between electrochemical equivalent and equivalent mass of a substance

Explanation

To distinguish between electrochemical equivalent and equivalent mass of a substance, let's break down the concepts step by step.

### Step-by-Step Solution:

**Step 1: Define Electrochemical Equivalent (Z)**
- The electrochemical equivalent (Z) of a substance is defined as the mass of the substance deposited or liberated at an electrode when one coulomb of electric charge is passed through the electrolyte.
- Mathematically, it can be expressed as:
\[
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