A 822-G Sample of Solid Calcium Reacted in Excess Fluorine Gas

question 85

Multiple Choice

A 8.22-g sample of solid calcium reacted in excess fluorine gas to give a 16-g sample of pure solid CaF₂.The heat given off in this reaction was 251 kJ at constant pressure.Given this information,what is the enthalpy of formation of CaF₂(s) ?

• A)251 kJ/mol
• B)250 kJ/mol
• C)-1.23 × 10³ kJ/mol
• D)-613 kJ/mol
• E)1.23 × 10³ kJ/mol

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