有两种外观类似黄金的①Cu-Zn合金和②Cu-Ag制品
\u6709\u4e24\u79cd\u5916\u89c2\u7c7b\u4f3c\u9ec4\u91d1\u7684\u2460Cu-Zn\u5408\u91d1\u548c\u2461Cu-Ag\u5408\u91d1\u5236\u54c1\uff0c\u82e5\u5b9e\u9a8c\u5ba4\u53ea\u63d0\uff1a\u89e3\uff1a\uff081\uff09\u8981\u6c42\u94dc\u7684\u8d28\u91cf\u5206\u6570\u9700\u80fd\u4f7f\u53e6\u5916\u4e00\u79cd\u91d1\u5c5e\u4e0e\u9178\u53cd\u5e94\uff0c\u5219\u53ea\u80fd\u9009\u2460
\u6545\u7b54\u6848\u4e3a\uff1a\u2460
\uff082\uff09\u7531\u9898\u610f\u53ef\u77e5\uff1aCu-Zn\u5408\u91d1\u4e0e\u7a00\u786b\u9178\u5b8c\u5168\u53cd\u5e94\u4ea7\u751f\u6c22\u6c14\u7684\u8d28\u91cf\u4e3a\uff1a
20g+50g-69.8g=0.2g
\u8bbe\u4ea7\u751f0.2g\u6c22\u6c14\u6d88\u8017\u91d1\u5c5e\u950c\u7684\u8d28\u91cf\u4e3ax
Zn+H2SO4=ZnSO4+H2\u2191
65 2
x 0.2g
652=x0.2g
x=6.5g
\u5408\u91d1\u4e2d\u91d1\u5c5e\u94dc\u7684\u8d28\u91cf\u4e3a20g-6.5g=13.5g
\u6240\u4ee5\u5408\u91d1\u4e2d\u94dc\u7684\u8d28\u91cf\u5206\u6570\u4e3a13.5g20g\u00d7100%=67.5%
\u7b54\uff1a\u2460\u4ea7\u751f\u6c22\u6c14\u7684\u8d28\u91cf\u4e3a0.2g\uff1b
\u2461\u8be5\u5408\u91d1\u4e2d\u94dc\u7684\u8d28\u91cf\u5206\u6570\u4e3a67.5%\uff0e
1\u3001\uff081\uff09
2\u3001m(H2)=50+20-69.8=0.2g
Zn+H2SO4=ZnSO4+H2
65 2
X 0.2
X=6.5g
Cu%=(20-6.5)/20=67.5%
（2）H2质量：70g-69.8g=0.2g
Zn+H2SO4===ZnSO4 + H2
65 161 2
x y 0.2g
x=6.5g y=16.1g
该合金中铜的质量分数= 20g-6.5g/20g×100%=67.5%
答：该合金中铜的质量分数为67.5%．
（3）ZnSO4质量分数16.1g÷69.8g×100%=23%
原创，望采纳
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