按体积计算，空气的成分大约为氮气78%，氧气21%，其他气体约占1%，已知在标准状况下，氮气的密度为1.25g/L
\u4e0b\u5217\u8bf4\u6cd5\u6b63\u786e\u7684\u662f\uff08\u3000\u3000\uff09 A\uff0e\u6309\u8d28\u91cf\u8ba1\u7b97\uff0c\u7a7a\u6c14\u4e2d\u7ea6\u542b\u6c2e\u6c1478%\uff0c\u6c27\u6c1421%\uff0c\u5176\u4ed6\u6c14\u4f53\u548c\u6742\u8d28\u7ea6\u53601% B\uff0eA\u3001\u6309\u4f53\u79ef\u8ba1\u7b97\uff0c\u7a7a\u6c14\u4e2d\u7ea6\u542b\u6c2e\u6c1478%\uff0c\u6c27\u6c1421%\uff0c\u5176\u4ed6\u6c14\u4f53\u548c\u6742\u8d28\u7ea6\u53601%\uff0c\u4e0d\u662f\u6309\u8d28\u91cf\uff0c\u6545\u8bf4\u6cd5\u9519\u8bef\uff1bB\u3001\u9c7c\u7c7b\u80fd\u5728\u6c34\u4e2d\u751f\u6d3b\uff0c\u8bc1\u660e\u6c34\u4e2d\u6709\u6c27\u6c14\uff0c\u4e0d\u80fd\u8bf4\u660e\u6eb6\u6709\u591a\u5c11\uff0c\u6545\u8bf4\u6cd5\u9519\u8bef\uff1bC\u3001\u4e0d\u7ba1\u662f\u6d01\u51c0\u7684\u7a7a\u6c14\uff0c\u8fd8\u662f\u88ab\u6c61\u67d3\u7684\u7a7a\u6c14\u4e2d\u90fd\u662f\u7531\u591a\u79cd\u7269\u8d28\u7ec4\u6210\u7684\uff0c\u90fd\u662f\u6df7\u5408\u7269\uff0c\u6545\u8bf4\u6cd5\u9519\u8bef\uff1bD\u3001\u7f8a\u6bdb\u7ea4\u7ef4\u71c3\u70e7\u6709\u70e7\u7126\u7fbd\u6bdb\u7684\u6c14\u5473\uff0c\u5408\u6210\u7ea4\u7ef4\u71c3\u70e7\u6ca1\u6709\u6b64\u6c14\u5473\uff0c\u56e0\u6b64\u7528\u71c3\u70e7\u7684\u65b9\u6cd5\u53ef\u533a\u522b\u7f8a\u6bdb\u7ea4\u7ef4\u548c\u5408\u6210\u7ea4\u7ef4\uff0c\u6545\u8bf4\u6cd5\u6b63\u786e\uff1b\u6545\u9009D\uff0e
\u6309\u4f53\u79ef\u7b97=\u6309\u7269\u8d28\u7684\u91cf\u7b97
\u5047\u8bbe\u53d6100L\u7a7a\u6c14\uff0c\u5219\u6c2e\u6c14\u4e3a78L\uff0c\u6c27\u6c14\u4e3a21L\uff0c\u5176\u5b83\u6c14\u4f531L\u3002
\u6807\u51b5\u4e0b\uff0c\u6c2e\u6c14\u5bc6\u5ea6\u4e3a1.25g\uff0c\u5219100L\u7a7a\u6c14\u4e2d\u6c2e\u6c14\u8d28\u91cf\u4e3a1.25*78g\uff0c
\u7531\u4e8e\u6c2e\u6c14\u6469\u5c14\u8d28\u91cf\u4e3a28\uff0c\u6c27\u6c14\u4e3a32\uff0c\u5219\u6c27\u6c14\u5bc6\u5ea6\u4e3a1.25*32/28\uff0c
\u5219100L\u7a7a\u6c14\u4e2d\u6c27\u6c14\u8d28\u91cf\u4e3a21*1.25*32/28\uff0c
100L\u7a7a\u6c14\u7684\u8d28\u91cf\u4e3a100*1.43\uff0c
100L\u7a7a\u6c14\u4e2d\u5176\u5b83\u6c14\u4f53\u8d28\u91cf\u5c31\u662f\u7a7a\u6c14\u8d28\u91cf\u51cf\u53bb\u6c2e\u6c14\u548c\u6c27\u6c14\u7684\u8d28\u91cf\u3002
\u8d28\u91cf\u5206\u6570\u5c31\u662f\u5404\u79cd\u6c14\u4f53\u8d28\u91cf\u9664\u4ee5\u7a7a\u6c14\u8d28\u91cf\uff0c\u4f60\u7528\u8ba1\u7b97\u5668\u6309\u4e00\u4e0b\u5c31\u53ef\u4ee5\u4e86\u3002
氧气质量分数=0.21*1.43/1.29=23.3%
其他气体质量分数=1-0.756-0.233=1.1%
设有1L的空气 则空气 氮气 氧气 的质量分别为 1.29g 1.25g 1.43g
氮气 氧气其他气体的体积分别为 0.78L 0.21L 0.01L
然后就可以求质量分数了
氮气：0.78*1.25/1.29=75.6%
氧气：0.21*1.43/1.29=23.3%
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绛旓細姘皵璐ㄩ噺鍒嗘暟=0.78*1.25/1.29=75.6 姘ф皵璐ㄩ噺鍒嗘暟=0.21*1.43/1.29=23.3 鍏朵粬姘斾綋璐ㄩ噺鍒嗘暟=1-0.756-0.233=1.1 璁炬湁1L鐨勭┖姘 鍒欑┖姘 姘皵 姘ф皵 鐨勮川閲忓垎鍒负 1.29g 1.25g 1.43g 姘皵 姘ф皵鍏朵粬姘斾綋鐨勪綋绉垎鍒负 0.78L 0.21L 0.01L 鐒跺悗灏卞彲浠ユ眰璐ㄩ噺鍒嗘暟浜 ...
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