Emf of the following cell at 298 K in V is : . The value of x is (Rounded off to the nearest integer). [Given: ; ; ]

Question

Emf of the following cell at 298 K in V is : . The value of x is  (Rounded off to the nearest integer). [Given: ; ; ]

Canvas Classes · Accepted Answer

🧠 Daniel-Cell-Style Setup With Zinc and Silver

The cell: .

- Anode (oxidation): .
- Cathode (reduction): . Need to balance to 2 e⁻: multiply by 2 → .

Net: , .

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🗺️ Reaction Quotient and Nernst

.

In : .

Answer: .

⚡ The Smart Move

When the cathode involves a coefficient ≠ 1, that coefficient becomes a power in . Here, "2 Ag⁺ → 2 Ag" puts  in the denominator of . Don't drop the squared exponent — it changes  by a non-trivial amount.

For this specific cell type (, factor of 2 on Ag⁺)

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