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【单选题】
下列叙述中,正确的是(  )
A.
H 2 SO 4 的摩尔质量是98
B.
等质量的O 2 和O 3 中所含的氧原子数相同
C.
等质量的CO与CO 2 中所含碳原子数之比为7:11
D.
98gH 2 SO 4 溶解于500mL水中,所得溶液中硫酸的物质的量浓度为2mol?L -1
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