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.
H2CO3 is carbonic acid. It is a central Carbon atom with one oxygen double bonded to the carbon and two single oxygen's covalently bonded to the carbon. The two oxygens with t â¦ he single bonds have the hydrogens bonded as well.arbonic acid is a weak acid, and so you might think that there would be nonionized H2CO3 molecules. That simply isn't the case. H2CO3 molecules don't exist in water. (H2CO3 molecules are thought to exist in interstellar space, but not on Earth, and not in water.).