Calculate the Energy Change for the Formation of CaF₂(s)from Its

question 21

Multiple Choice

Calculate the energy change for the formation of CaF₂(s) from its elements in their standard states and the following information: Ca(s) + F₂(g) → CaF₂(s) ?
Ca(s) → Ca(g) +179.3 kJ/mol
Ca(g) → Ca⁺(g) + e^- +589.9 kJ/mol
Ca⁺(g) → Ca²⁺(g) + e^- +1145 kJ/mol
1/2 F₂(g) → F(g) +79.0 kJ/mol
F(g) + e^- → F^-(g) -328.0 kJ/mol
CaF₂(s) → Ca²⁺(g) + 2 F^-(g) +2630 kJ/mol

• A)+4046 kJ/mol
• B)-965 kJ/mol
• C)-1214 kJ/mol
• D)-3286 kJ/mol

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