I tried to use many methods to solve this problem, but encountered a lot of difficulties, I would like to ask you how to solve this problem better, thank you enter image description here

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    $\begingroup$ Many questions are about inorganic chemistry. The title should be more specific to distinguish the question from other questions. $\endgroup$ – Poutnik Nov 21 at 1:37
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    $\begingroup$ We have a policy which states that ‎you should explicitly show your thoughts, effort and attempts to understand underlying principles and solve the question. ( "I am stuck!" does not count. ) It'll make us certain that ‎we aren't doing your homework for you. ( As homework is considered literal homework, self-study questions, puzzles, worked examples etc.) Please provide your full reasoning or thoughts on this, otherwise, the question may get closed.‎ See Homework $\endgroup$ – Poutnik Nov 21 at 1:39
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    $\begingroup$ Using photos/screenshots of ( even handwritten) text instead of typed text itself is strongly discouraged. It is impossible to index/search/reuse it in answers referring to it. In a case of handwritten text, it puts extra burden on responders to properly decipher it. That all may lead to the question being ignored or even closed. Consider copy/paste or retyping and using eventually MathJax for expressions and formulas. $\endgroup$ – Poutnik Nov 21 at 1:40