The volume of an irregular shaped object such as a rock is best measured using

The chemical bubbles

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.

#2- the hno3 has a h+ ion and the naoh has an oh- ion