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Given the following information, how would the reaction between sulfur dioxide and oxygen to produce sulfur trioxide be best described?

$$ 2S_{(s)} + 3O_{2(g)} \rightarrow 2SO_{3(g)} \quad \Delta H = -790 \text{ kJ} $$

$$ S_{(s)} + O_{2(g)} \rightarrow SO_{2(g)} \quad \quad \Delta H = -297 \text{ kJ} $$

A

Exothermic with a net energy of 196 kJ.

B

Endothermic with a net energy of 196 kJ.

C

Exothermic with a net energy of 1384 kJ.

D

Endothermic with a net energy of 1087 kJ.

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