m(A2O)=9.4г
m(A2)=7.8г
m(O)=9.4-7.8=1.6г
n=m/M=1.6/16=0.1моль
M(A2)=7.8:0.1=78г/моль
M(A)=78:2=39г/моль
Ответ:39г/моль
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m(A2O)=9.4г
m(A2)=7.8г
m(O)=9.4-7.8=1.6г
n=m/M=1.6/16=0.1моль
M(A2)=7.8:0.1=78г/моль
M(A)=78:2=39г/моль
Ответ:39г/моль