Set up Nernst equation for the standard dry cell. Using this eqation show that the voltage of a dry cell has to decrease with use.

Explanation

To set up the Nernst equation for a standard dry cell (Leclanché cell) and demonstrate how its voltage decreases with use, we can follow these steps:

### Step 1: Understand the Components of the Dry Cell
A dry cell consists of:
- **Anode**: Zinc container (Zn)
- **Cathode**: Graphite rod (C)
- **Electrolyte**: Paste of ammonium chloride (NH4Cl) and zinc chloride (ZnCl2)
- **Oxidation Reaction**: At the anode, zinc is oxidized:
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