Question

consider the following thermochemical reaction:

2so₂(g) + o₂(g) → 2so₃(g) + 199. kj

part: 0 / 2

part 1 of 2

is this reaction endothermic or exothermic? select the single best answer.

endothermic

exothermic

Explanation:

In a thermochemical reaction, if heat is a product (appears on the right - hand side of the reaction arrow), the reaction releases heat, which means it is exothermic. In the given reaction \(2SO_2(g)+O_2(g)\to2SO_3(g) + 199\space kJ\), heat (\(199\space kJ\)) is a product, so the reaction releases heat. Endothermic reactions absorb heat (heat is a reactant), while exothermic reactions release heat (heat is a product).

Answer:

exothermic