已知,則為()。
A.442.3kJ·mol-1 B.260.7kJ·mol-1 C.-260.7kJ·mol-1 D.-442.3kJ·mol-1
A. B. C. D.
A.2×0.787/0.0592 B.0.787/0.0592 C.0.0592×0.787/2 D.0.0592/0.787