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.
Why is calcium oxide CaO but calcium chloride is CaCl2? in calcium chloride each calcium atom needs to lose two electrons but each chlorine atom needs to gain only one electron. This means that two chlorine atoms react with every o â¦ ne calcium atom to form calcium chloride. So the formula for calcium chloride is CaCl2. ca = proton number is 20 so the structure would be 2, 8 ,8 ,2 cl = proton number is 17 so the structure would be 2 , 8,7 To make it stable calcium has to lose 2 electrons and chlorine has to gain an electron.