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【单选题】
37 17Cl、35 17Cl为不同的核素， N A 为加德罗常数，下列说法正确的是A.
常温下，4.48L 35 17Cl 2 含有0.72 N A 个中子
B.
37 17Cl、35 17Cl互为同位素，35 17Cl 2 与37 17Cl 2 互为同分异构体
C.
通常情况下，氯气做氧化剂，但氯气也具有还原性
D.
37 17Cl 2 的摩尔质量是74
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