What is the molecular formula of the alkane with 15 carbon atoms?

1) according to the law of conservation of mass ,in all chemical reactions total mass is unchanged

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.

Reaction type : double replacement hcl + lioh = h2o + licl