铜的物质的量＝1.92g/64g/mol=0.03mol
n(HNO3)=0.2mol/L*0.25L=0.05mol
n(H2SO4)=0.1mol/L*0.25mol=0.025mol
n(H^+)=0.05mol+2*0.025mol=0.1mol
3Cu + 8H^++2NO3^-=3Cu^2+ +2NO↑+4H2O
3 8 3
0.03mol X Y
X=0.08mol