For the reaction 3znco3 + 2h3po4 —> 3h2o + 3co2, how many miles of zinc carbonate are required to produce 3.0 mil of zn3(po4)2?

Explanation:

(a) Balanced equation

3ZnCO₃ + 2H₃PO₄  ⟶ Zn₃(PO₄)₂ + 3H₂O + 3CO₂

(b). Calculation

You want to convert moles of Zn₃(PO₄)₂  to moles of ZnCO₃

The molar ratio is 1 mol Zn₃(PO₄)₂:3 mol ZnCO₃  

You need to form 3.0 mol of Zn₃(PO₄)₂.

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.