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Number of bridging CO ligands in Mn2(CO)10

The same question, asked 2 times: 2021 Paper 25, 29 Jan 2023. Every wording below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    2021 Paper 25

    55
    Number of bridging COCO ligands in [Mn2(CO)10]\left\lbrack Mn_{2}(CO)_{10} \right\rbrack is
  2. Question 2

    29 Jan 2023

    53
    The sum of bridging carbonyls in W(CO)6W(CO)_{6} and Mn2(CO)10Mn_{2}(CO)_{10} is_____