What is the net ionic equation for Li3PO4 and Ba(NO3)2 ?

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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.