Most photos we see of Enya are the photos in the album booklets, or photos from magazines. As it is with all artists, Enya wears cosmetics in these photos, and sometimes the photos might be retouched to create a certain look.
Introduction Heat of formation is the enthalpy change when one mole of product is formed from its constituent elements under standard conditions. The equation for the formation of calcium carbonate from its elements under standard conditions is Ca(s)+C (graphite)+O2 (g) CaCO3(s).HfO (CO2 (g)) = -393.5 kJ mol -1 ?HfO (H2O (l)) = -285.5 kJ mol -1 Heat of formation of calcium carbonate = ?H1 + ?Hf (CO2 (g)) +?Hf (H2O (l))- ?H2 = -421+(-393.5)+(-285.5)- (-17.6) = -1082.4 kJ mol -1 In order to achieve the answer, Hess's law is used.
And carbonate anion also has the valency two. So the formula ZnCO3. In ionic forms Zn2+ and CO32-. Zinc carbonate is formed by the reaction with zinc hydroxide or Zinc metal with carbonic acide. Carbonic acid is nothing but carbon di oxide gas dissolved in water. (Soft drink beverages) Zn + H2CO3 = ZnCO3 + H2 Zinc carbonate is different from zinc bi carbonate Zn(HCO3)2 By Dr M Kanagasabapathy Asst. Professor, Department of Chemistry Rajus College, Affiliated to M K university Rajapalayam (TN) India PIN 626 117.