100. Considering the following oxidation–reduction reaction, after balancing the equation, how many of the following statements are correct?
$$\text{AuI}_2^-(aq) + \text{Cu}(s) \longrightarrow \text{Au}(s) + \text{Cu}^{2+}(aq) + \text{I}^-(aq)$$
$$E^\circ(\text{AuI}_2^- / \text{Au} + \text{I}^-) = +0.56\,\text{V}, \quad E^\circ(\text{Cu}^{2+}/\text{Cu}) = +0.34\,\text{V}$$
- This reaction proceeds spontaneously.
- In this reaction, 6 moles of electrons are exchanged.
- One polyatomic ion plays the role of oxidizing agent in this reaction.
- The sum of stoichiometric coefficients of substances in this reaction is 18.
(4) 1 (3) 2 (2) 3 (1) 4
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