\(n_{NaOH}\)=0.2.0.045=0.009 mol
SO2 + 2NaOH\(\rightarrow\)Na2SO3+H2O
0.0045\(\leftarrow\)0.009\(\rightarrow\)0.0045
SO2+Na2SO3+H2O\(\rightarrow\)2NaHCO3
amol\(\rightarrow\)amol----------\(\rightarrow\)2amol
ta có :126(0.0045-a)+208=0.608
\(\rightarrow\)0.567-126a+208a=0.608
\(\rightarrow\)82a=0.041
\(\rightarrow\)a=0.0005
nSO2=0.0005+0.0045=0.005 mol
Vậy: R+2H2SO4\(\rightarrow\)RSO4+SO2+2H2O
0,005\(\leftarrow\)----------------------0.005
MR=\(\dfrac{0,32}{0,005}\)=64
=> R là Cu