题目

—I hope I can get better grades this time. _________. You have studied even harder than before. A. I don’t think so     B. I’m afraid so     C. I hope so               D. I can’t believe it 答案：C（9分）将250mLH2SO4的质量分数为98%，密度为1.84g/cm3的浓硫酸稀释到1000mL。（1）浓硫酸的物质的量浓度是多少？（2）此时溶液中H2SO4的物质的量是多少？（3）稀释后溶液中H+的物质的量浓度是多少？