Calcium oxide lime reacts with carbon dioxide to form calciu

Calcium oxide (lime) reacts with carbon dioxide to form calcium carbonate (chalk). CaO(s) + CO2(g) ? CaCO3(s) ?H = -178.4 kJ

(a) Is this reaction exothermic or endothermic?

(b) How many kilojoues of heat are evolved in the reaction of 350.0 g of CaO(s) with an excess of carbon dioxide?

(c) How many grams of CaCO3(s) are produced during an enthalpy change of -452.5 kJ?

Solution

1)

Exothermic

2)

350/molar mass = 350/56 = 6.25 moles

energy = 6.25*-178.4 KJ = -1115KJ

3)

452.5/178.4 = x/ 100

X= 253.6gms