题目：
现有一氧化碳和二氧化碳的混合气体20g，其中氧元素的质量分数为64%。先使该混合气体通过灼热的氧化铜再通过足量的澄清石灰水中，生成沉淀的质量为________。
答案：
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参考答案：A
现有一氧化碳和二氧化碳的混合气体20g，其中氧元素的质量分数为64%。先使该混合
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