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`Be_((g))toBe^(+) _(g),Delta H=-xKJ//mol.` In the reaction of `Be(g)to Be^(=2) (g),DeltaH `is approximately in KJ/mol

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`Be_((g))toBe^(+) _(g),Delta H=-xKJ//mol.` In the reaction of `Be(g)to Be^(=2) (g),DeltaH `is approximately in KJ/mol
A. 2x
B. 3x
C. 4x
D. 8x
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