Question: Given that Na2O and SiO2 combine to form the silicate Na2SiO3, use the data below to show that the calcination of NaCO3 is only

Given that Na2O and SiO2 combine to form the silicate Na2SiO3, use the data below to show that the calcination of NaCO3 is only favourable in the presence of enough silica to form the silicate. All data are in kJ/mol. Compound AG 900C AfG 1000C AfG 1100C SiO (s) -700 -255 -396 NaCO3(1) -806 NaSiO3(s) -1185 NaO(s) CO(g) -683 -242 -396 -783 -1154 -666 -230 -396 -760 -1124

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