The length of time it takes for a planet to revolve around the sun is equivalent to which of the following?
a) the length of its decade
b) the length of its day
c) the length of its year
d) the length of its month

1. o2(g)as a product

Answerδh > 0explanationc₆h₆  (s)  → c₆h₆ (l)if you are changing it from a solid to a liquid, you are pretty much melting the solid. this requires heat energy. therefore, the reaction is endothermic (takes in energy); the system enthalpy increases as the reaction proceeds: δh > 0.

Ijust took the quiz. their is no coefficient needed. : )