массовую долю серы:
а) Na2So4
Mr (Na2So4) =
w(S) =
б) SOз
Mr (SOз) =
w (S) =
в) CuS
Mr (CuS) =
w(S) =
г) H2SOз
Mr (Na2SOз)
w (S) =
а) Na2So4
Mr (Na2So4) =
w(S) =
б) SOз
Mr (SOз) =
w (S) =
в) CuS
Mr (CuS) =
w(S) =
г) H2SOз
Mr (Na2SOз)
w (S) =
Answers & Comments
W(S)32:142*100%=22%
б)M(SO3)32*1+16*3=80
W(S)= 32:80*100%=40%
в)M(CuS)=64*1+32*1=96
W(S)=32:96*100%=33%
г)M(H2SO4)1*2+32*1+16*3=82
W(S)32:82*100%=39%