现有Na2CO3和Na2SO4的固体混合物共12g,将它放入98g20%的H2SO4溶液中,充分反应后溶液呈酸性;在此酸性溶液中再加入80g10%的NaOH溶液,恰好完全中和。计算恰好完全中和后,所得溶液中溶质的质量分数。(计算结果精确到0.1%) 答案:解:H2SO4的质量:;的质量: 设与NaOH反应的H2SO4的质量为,生成的Na2SO4的质量为 98 142 8g 与反应的H2SO4的质量: 设与H2SO4反应的Na2CO3的质量为,生成的Na2SO4的质量为,生成的CO2的质量为 10Where will Sandy go this winter vacation?A. The USA. B. Australia. C. Belgium.
B
【解析】略
M: Where will you go this winter vacation, Sandy?
W: Australia. It’s very warm so I’ve decided to go there.