Respuesta :
I would say A.
Because it is cooling down, going from liquid to solid, so it is loosing energy. THis energy must be being released to the surroundings so
Because it is cooling down, going from liquid to solid, so it is loosing energy. THis energy must be being released to the surroundings so
Answer: Option (a) is the correct answer.
Explanation:
Enthalpy is defined as the total amount of heat present in a system.
When there is bond formation in a chemical reaction then it means energy is released. Hence, the reaction is exothermic in nature and [tex]\Delta H[/tex] < 0 or negative.
On the other hand, when breaking of bonds occurs then energy is absorbed by the system. Hence, the reaction is endothermic in nature and [tex]\Delta H[/tex] > 0 or positive.
Thus, in the given reaction [tex]C_{6}H_{6}(l) \rightarrow C_{6}H_{6}(s)[/tex], the state is changing from liquid to solid.
This means atoms are coming close to each other and hence, there is occurrence of bond formation. As a result, energy will be released to the surroundings.
Hence, we can conclude that H < 0 for the given reaction.
