Energetics

Easy

Which reaction has a standard enthalpy change equal to the standard enthalpy of formation for aluminium iodide?

$Al(s)+32I2(g)→AlI3(s)\text{Al(s)} + \frac{3}{2}\text{I}_2\text{(g)} \rightarrow \text{AlI}_3\text{(s)}$

$2Al(s)+3I2(s)→2AlI3(s)2\text{Al(s)} + 3\text{I}_2\text{(s)} \rightarrow 2\text{AlI}_3\text{(s)}$

$Al(s)+32I2(s)→AlI3(s)\text{Al(s)} + \frac{3}{2}\text{I}_2\text{(s)} \rightarrow \text{AlI}_3\text{(s)}$

$Al3+(g)+3I−(g)→AlI3(s)\text{Al}^{3+}\text{(g)} + 3\text{I}^-\text{(g)} \rightarrow \text{AlI}_3\text{(s)}$

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