4 CaCO3 in the form of limestone is the starting mineral for the production of c

Question

4 CaCO3 in the form of limestone is the starting mineral for the production of cement. In cement kilns, limestone is heated to approximately 1300 K, at which temperature it decomposes to CaO, ''lime''. From the Cp,m value in the appendix, and assuming the Cp,m of CaCO3 to be independent of temperature, calculate the energy (heat, expressed as Joules)needed to heat 5 metric tonnes (5000 kg) of limestone from 20 degree C to 1300K. Remember that for solids energy and enthalpy can be considered the same. Answer: Energy needed =

Explanation / Answer

given CaCO3 = 5000 kg

Timechange: 20 to 1300 K

= -253 degrees C to 1027 degres

Cp of CaCO3 = 0.18 kcal/kg * C

Q = 5000 kg * 0.18 kcal/kg * C * (1027 - (-253) C

= 1152000 kcal

1152000 cal * 1000 cal * 4.18 Joules

1 1 kcal 1 cal

= 4, 815, 360, 000 Joules

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