题目内容

将一定量的KClO3加热后，其质量减少0.48g。生成的氧气用排水集气法收集，若温度为21℃，压力为99591.8Pa，水的饱和蒸汽压为2479.8Pa，氧气的相对分子质量为32.0，则收集的气体体积为（）

A. 188.5
B. cm3
C. B．754
D. cm3
E. C．565.4
F. cm3
G. D．377.6
H. cm3

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将一定量的KClO3加热后，其质量减少0.48g。生成的氧气用排水集气法收集，若温度为21℃，压力为99591.8Pa，水的饱和蒸汽压为2479.8Pa，氧气的相对分子质量为32.0，则收集的气体体积为（）

A. 188.5 B. cm3 C. B．754 D. cm3 E. C．565.4 F. cm3 G. D．377.6 H. cm3

The author of the Wealth of Nations was（）

Which of the following are reasons why increasing marginal costs of production arise？I. Different products use inputs to production in different proportions.II. Different inputs are better utilized in

All of the following can lead to an increase in the demand for ice cream, a normal good, EXCEPT（）

The one unknown word in fifty is something that can be learned through（）

A. 188.5
B. cm3
C. B．754
D. cm3
E. C．565.4
F. cm3
G. D．377.6
H. cm3