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116问答网 > 标准状况下，空气密度为1.293g⼀L，氧气密度是1.429⼀L，

标准状况下，空气密度为1.293g⼀L，氧气密度是1.429⼀L，

2025-04-03 11:57:57

推荐回答（2个）

回答1：

解：设空气的体积为1L，因为氧气在空气中的体积分数为21%，所以氧气体积为0.21L，
因为物质的质量=体积×密度，
所以空气的质量=1L×1.293g/L=1.293g，
氧气的质量=0.21L×1.429/L=0.3g，
所以空气中氧气质量分数=(0.3g /1.293g )×100%=23%．

回答2：

设空气的体积为1L，因为氧气在空气中的体积分数为21%，所以氧气体积为0.21L，
因为物质的质量=体积×密度，
所以空气的质量=1L×1.293g/L=1.293g，
氧气的质量=0.21L×1.429/L=0.3g，
所以空气中氧气质量分数=

0.3g

1.293g

×100%=23%．
故选B．

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