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一、选择题 1.一定量碳(由~(12)C和~(13)C组成)在足量氧气中燃烧,所得气体对氢气的相对密度为22.49,则~(12)C和~(13)C质量比约是( )。
First, multiple-choice questions 1. A certain amount of carbon (composed of ~(12)C and ~(13)C) is burned in a sufficient amount of oxygen, and the relative density of the resulting gas to hydrogen is 22.49, then ~(12)C and ~( 13) The mass ratio of C is about ().