Energy is required to remove two electrons from Ca to form Cat, and energy is re

Question

Energy is required to remove two electrons from Ca to form Cat, and energy is required to add two electrons to O to form O~. Yet Cao is stable relative to the free elements Which statement is the best explanation? (a) The lattice en- ergy of CaO is large enough to overcome these processes (b) CaO is a covalent compound, and these processes are ir- relevant. (c) CaO has a higher molar mass than either Ca or O. (d) The enthalpy of formation of CaO is small. (e) Cao is sta ble to atmospheric conditions.

Explanation / Answer

'(a)' is the correct explanation of the relative stability of CaO to the free elements

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