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1
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Which of these statements are true? Select all that apply.

A
The Hf for Br2(I) is 0 kJ/mol.
Option A
B
The Hf for He(I) is 0 kJ/mol.
Option B
C
The Hf for Hg(I) is 0 kJ/mol.
Option C
D
The Hf for Cl2(g) is 0 kJ/mol.
Option D
E
The Hf for N2(I) is 0 kJ/mol.
Option E
2
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This reaction is .

A
endothermic
B
exothermic

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