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Question
Using average bond energies found at the URL below, what is two times the heat of formation of HBr (g)? Remember that heat of formation reactions form one mole of a substance from its constituent elements in their standard states
Options:
A .  -101
B .  -101 kJ/mol
C .  -101kJ/mol
D .  -101 kJ
E .  -101kJ
Answer: Option A

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