Zn+H2SO4=ZnSO4+H2↑哪培敬65 98 2 0.4gm(Zn)=65/2*0.4g=13gm(H2SO4)=98/2*0.4g=19.6g需要稀硫酸19.6g/20%=98g需要中告浓硫酸李慎(19.6g/98%)/1.84=10.87mL