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又一道英文化学题..Which one of the following is not the same number

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又一道英文化学题..
Which one of the following is not the same number as the rest?
A.The number of molecules in 4 moles of CO2.
B.The number of hydrogen atoms in 2 moles of H2O.
C.The number of chloride ions in 4 moles of CaCl2.
D.The number of hyfrogen atoms in 1 mole of C3H8.
请给出理由,
又一道英文化学题..Which one of the following is not the same number
B中要考虑 水自身的水解反应吗?虽然常温下很微弱

考虑下,下面这个解释,合理吗?
A 中问的是分子的数目,所以是4摩尔CO2 分子
C 中问的是氯离子（ chloride ions）的数目, 是8摩尔
D 中问的是氢原子的数目,是8摩尔

B 这个答案不完全确切的,当考虑常温下水自身的水解反应时,氢原子应该是小于8摩尔的；如不考虑水解反应,那么是8摩尔.
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