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Calculate the energy change (in kilojoules per mole) for the formation of the following substances from...

Calculate the energy change (in kilojoules per mole) for the formation of the following substances from their elements.

CaF2

(The sublimation energy for Ca is +178.2 kJ/mol, Ei1 = +589.8 kJ/mol, Ei2 = +1145kJ/mol, and the lattice energy of CaF2 is 2630 kJ/mol.)

Express the energy change in kilojoules per mole to four significant digits.

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