1)Mr(CuSO4)=160г/моль
2)2:12:48
3)
a)w(CuSO4)=100%
w(Cu)=64/160=40%
w(S)=32/160=20%
w(O)=64/160=40%
b)
w(Fe2O3)=100%
w(Fe)=112/160=70%
w(O)=48/160=30%
c)
w(HNO3)=100%
w(H)=1/63=2%
w(N)=14/63=22%%
w(O)=48/63=76%
4)w(S) в SO3=40% ;w(S) в SO2=50% Ответ:в 1,25 раз