When 19.5 g of calcium phosphate reacts with 25 mL sulfuric acid (density 1.6 g/mL), what mass of the acid is produced?

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.

The ratio is 3: 2. i.e. c.