A. Br-
B.Na+
C.H20
D.CO2
E. None of the above
Thanks
______ Has a Hf of zero?
2016-05-16 6:47 pm
回答 (2)
2016-05-16 6:56 pm
✔ 最佳答案
ΔHf of an element in its standard state is zero.Br⁻ and Na⁺ are ions, while H₂O and CO₂ are compounds. All of them are not elements in its standard state. Thus, none of them has a ΔHf of zero.
...... The answer is : E. None of the above
2016-05-16 6:57 pm
None of the above. None of these are element in their standard states.
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