Once there was a young man, he sold fruits at the market every day in the town.   1_. He believe that the earlier he got go the market, the more he could sell. This made other sellers came to the market earlier and earlier.

To get up even earlier, he thought that if he ate his breakfast at night, he wouldn’t have to eat it in the morning.    2  . He went to bed stuffed(饱) that night, but he knew it was for a good cause.

Morning came and the young man was surprised to see that there were many people there.      3    That night he decided to get dressed at night so he could save time in the morning. He went to bed with his clothes on, but in the morning some sellers were there before him again.

    4    He carried his bed to town. That night, he lay in his bed and watched the night sky. The moon was full and he was very excited.     5    When morning came, the young man was so sleepy and tired that he couldn’t get up.

某同学为探究铜铁合金中铁的质量分数，取该合金与稀硫酸反应，先后进行了三次实验，实验数据见下表：

（1）上表三次实验中，合金里的铁恰好完全反应时，消耗稀硫酸溶液的质量是______ g．

（2）该铜铁合金中铁的质量分数是多少？

（3）求第三次实验所得溶液中硫酸亚铁的质量分数．（精确至0.1%）