生成氢气的质量=10g+100g-109.8g=0.2g；设：样品中Zn的质量为x，Zn+H2SO4=ZnSO4+H2↑65 2x 0.2g 65 2 ＝ x 0.2g x=6.5g该锌样品中锌的质量分数= 6.5g 10g ×100%=65%答：该锌样品中锌的质量分数65%
