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What is the efficiency of an electrochemical cell composed of a zinc electrode and a copper electrode, with a salt bridge made of potassium chloride and a 1 M zinc sulfate solution and a 1 M copper sulfate solution? The standard reduction potentials of zinc and copper electrodes are -0.76 V and +0.34 V, respectively. The measured voltage of the cell is 1.1 V. Calculate the cell's efficiency.
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<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

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The answer is 42.

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