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【单选题】
N A 代表加德罗常数，下列说法正确的是（ ）A.
N A 个Na变成Na + 时失去的电子数目为11N A
B.
1molH 2 和1molH 2 O所含分子数相等，但在相同状况下，所占体积一定不相等
C.
质量相等的不同的纯净物，物质的量越多，则其摩尔质量越小
D.
标准状况下，22.4L氧气和臭氧的混合物中所含氧原子数为2.5N A
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