解:(1)m(H2SO4)=1.84g/cm3 ×500mL ×98%=901.6g(2) m浓×w1=m稀×w2 m浓×98%=100g×19.6% m浓=20g 请采纳
(1)溶质质量=溶液质量*质量分数所以m(H2SO4)=1.84 ×500 ×98%g=901.6g(2)抓住不变量——硫酸的质量m浓×98%=100g×19.6 m浓=20g
(1),19.6g(2),20g
10.9ml