Determine the density of ethanol if 15.0 milliliters if it weighs 12.9 g

Copper, silver, aluminum, cobalt, chromium, mercury 

Answer:

5.6⋅10−^19  j

do you need the explaination?

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.