氧气与甲烷 混合气体在标准状况下的密度为1.25GL，氧气与甲烷的质量比为

\u67d0\u6df7\u5408\u6c14\u4f53\u53ea\u542b\u6709\u6c27\u6c14\u548c\u7532\u70f7,\u5728\u6807\u51c6\u72b6\u51b5\u4e0b,\u8be5\u6c14\u4f53\u7684\u5bc6\u5ea6\u4e3a1.00g/l\u6c42\u8be5\u6c14\u4f53\u4e2d\u6c27\u6c14\u548c\u7532\u70f7\u7684\u4f53\u79ef\u6bd4? \u8981\u5168\u8fc7\u7a0b

\u89e3\uff1a\u7531\u6c14\u4f53\u7269\u8d28\u7684\u6469\u5c14\u8d28\u91cf\uff1d\u6c14\u4f53\u7684\u5bc6\u5ea6\u4e0e\u6807\u51c6\u72b6\u51b5\u4e0b\u7684\u6c14\u4f53\u6469\u5c14\u4f53\u79ef\u4e4b\u79ef\uff0c\u53ef\u6c42\u51fa\u6df7\u5408\u6c14\u4f53\u7684\u5e73\u5747\u6469\u5c14\u8d28\u91cf\uff1a
M\uff1d1.00g/L\u00d722.4L/mol\uff1d22.4g/mol
\u518d\u7531\u5e73\u5747\u6469\u5c14\u8d28\u91cf\u8ba1\u7b97\u65b9\u6cd5:
\u5e73\u5747\u6469\u5c14\u8d28\u91cf =\u6df7\u5408\u7269\u4e2d\u5404\u7ec4\u5206\u7684\u6469\u5c14\u8d28\u91cf\u00d7\u8be5\u7ec4\u5206\u7684\u7269\u8d28\u7684\u91cf\u5206\u6570\uff08\u82e5\u662f\u6c14\u4f53\u7ec4\u5206\u53ef\u4ee5\u662f\u4f53\u79ef\u5206\u6570\uff09\u6240\u5f97\u7684\u79ef\u4e4b\u548c
\u5c31\u53ef\u4ee5\u6c42\u51fa\u5176\u4f53\u79ef\u6bd4\u4e86\uff1a\u8bbe\u6c27\u6c14\u7684\u4f53\u79ef\u5206\u6570\u4e3ax\uff0c\u5219\u6709\uff1a
32x\uff0b16(1-x)=22.4
16x=6.4 x=0.4
\u6240\u4ee5\u6c27\u6c14\u4e0e\u7532\u70f7\u7684\u4f53\u79ef\u6bd4\u4e3a: 0.4\u2236(1-0.4)=2\u22363.
\u7531\u4e8e\u6b64\u6df7\u5408\u7269\u662f\u4e8c\u5143\u6df7\u5408\u7269\uff0c\u4e5f\u53ef\u4ee5\u7528\u5341\u5b57\u4ea4\u53c9\u6cd5\u7b80\u6d01\u6c42\u89e3\u3002

\u03c1=M/Vm
\u6240\u4ee5\u6807\u6001\u4e0b\u6c27\u6c14\u5bc6\u5ea6\uff1a32/22.4 \u7532\u70f7\u5bc6\u5ea6\uff1a16/22.4
( 32/22.4*v1+16/22.4*v2)/(v1+v2)=1
v1/v2=7/8

1mol混合气体的质量m=1.25*22.4=28g
设甲烷x:
16x+32(1-x)=28
16x+32-32x=28
16x=4
x=1/4=25%
3:1

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