The standard heat of combustion of solid boron is:
(A) \( \Delta_{f} H^{\circ}\left(\mathrm{B}_{...
The standard heat of combustion of solid boron is:
(A) \( \Delta_{f} H^{\circ}\left(\mathrm{B}_{2} \mathrm{O}_{3}\right) \)
(B) \( \frac{1}{2} \Delta_{f} \Delta H^{\circ}\left(\mathrm{B}_{2} \mathrm{O}_{3}\right) \)
(C) \( -\Delta_{f} H^{\circ}\left(\mathrm{B}_{2} \mathrm{O}_{3}\right) \)
(D) \( -\frac{1}{2} \Delta_{f} \Delta H^{\circ}\left(\mathrm{B}_{2} \mathrm{O}_{3}\right) \)
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