Witherite is a mineral which is composed mainly of barium carbonate (BaCO 3 ). W

Question

Witherite is a mineral which is composed mainly of barium carbonate (BaCO3). When heated, this compound decomposes to form barium oxide and carbon dioxide, as expressed by the following equation.

Compound Enthalpy of formation
(kJ/mol) BaCO3(s) ?1213.0 BaO(s) ?548.0 Witherite is a mineral which is composed mainly of barium carbonate (BaCO3). When heated, this compound decomposes to form barium oxide and carbon dioxide, as expressed by the following equation. BaCO3(s) ? BaO(s) + CO2(g) The standard enthalpy change for this reaction is +271.5 kJ/mol, and the standard enthalpies of formation of BaCO3(s) and BaO(s) are given in the table below.

Explanation / Answer

(a) BaCO3(s) => BaO(s) + CO2(g)

DH(rxn) = +271.5 kJ/mol


DH(rxn) = DH(formation of products) - DH(formation of reactants)

= DH(formation of BaO) + DH(formation of CO2) - DH(formation of BaCO3)


271.5 = -548.0 + DH(formation of CO2) - (-1213.0)


DH(formation of CO2) = 271.5 + 548.0 - 1213.0

= -393.5 kJ/mol


(b) BaO(s) + CO2(g) => BaCO3(s)

DH(reverse reaction) = -DH(rxn)

= -271.5 kJ/mol

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