Which atom has the larger electronegativity? B, N, C, O

Maybe you should get some from your teacher and learn more so you can get your grades up and maybe study a bit more

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.