Cu + 2 H2SO4 = CuSO4 + SO2 + 2 H2O
64g Cu.................................2x 98g H2SO4................22, 4 L SO2
38,4g Cu ............................X g....................................Yl
X =117,6g H2SO4 = md Y = 13,44 L SO2
ms= 117,6x100/98=120g sol H2SO4