用一个大于0的自然数，分别去除35、59和123，所得的余数相同．这个数是____ ．

①3Cu+8HNO₃=3Cu（NO₃）₂+2NO↑+4H₂O

未被还原的硝酸与参加反应的总硝酸的质量比为____．

②S+2KNO₃+3C $\underset{\_}{\underset{\_}{点燃}}$ K₂S+N₂↑+3CO₂↑  还原剂是____  还原产物是____

③3Cl₂+6NaOH $\underset{\_}{\underset{\_}{△}}$ 5NaCl+NaClO₃+3H₂O 反应中若消耗3molCl₂共转移____ mol电子．

    Alice's class planned to make a class newspaper. All the students wrote stories, articles or poems for it. One day Alice said to the teacher, “Most newspapers have advertisements. Can we put some in our newspaper?”

    The teacher agreed at once. She made Alice the advertising manager, and then Alice asked her classmates to advertise in the newspaper. Here are some of the ads Alice received.