设H2SO4的质量是x
Zn + H2SO4 = ZnSO4 + H2↑
6598
6.5 g x
65/98 = 6.5 g / x
解得 x = 9.8 g
溶质质量分数 = 9.8 g ÷ 100 g * 100% = 9.8 %