Question

含杂质的废铁屑8g与足量的稀硫酸反应,生成氢气0.2g,求该废铁屑中铁的质量分数?

Answer 1

Fe+H2SO4=FeSO4+H2

56 2

x 0.2

56/x=2/0.2

x=5.6

5.6/8=70%