The Value of ?_fG° at 400 $\mathrm { Cl } _ { 2 }$

question 11

Multiple Choice

The value of ?_fG° at 400.0 °C for the formation of calcium chloride from its constituent elements, Ca(s) + $\mathrm { Cl } _ { 2 }$ (g) ? $\mathrm { CaCl } _ { 2 }$ (s)
Is ________ kJ mol^-1.At 25.0 °C for this reaction,?_fH° is -795.8 kJ mol^-1,?_fG° is -748.1 kJ mol^-1,and $\Delta _ { \mathrm { f } } S ^ { \circ }$ is $- 159.8 \mathrm {~J} \mathrm {~K} ^ { - 1 } \mathrm {~mol} ^ { - 1 }$

• A)-731.9
• B)-903.3
• C)1.07 × 10⁵
• D)6.31 × 10⁴
• E)-688.3