2H2SO4 +2Ag -> Ag2SO4 + 2H2O +SO2
M H2SO4=98 g/mol
M Ag=108 g/mol
M SO2=64 g/mol
98/100 *100=98 g H2SO4
2*98 g H2SO4...............2*108 g Ag
98 g H2SO4..................x g Ag
x=108 g Ag
2*98 g H2SO4..........................64 g SO2
98g H2SO4.............................y
y=32 g SO2 => 0,5 moli