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Difference in molar mass between members of a homologous series

The same question, asked 3 times: 15 May 2023 S1*, 26 Apr 2025 S1*, 11 Apr 2026 S2. Every wording below, oldest first.

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  1. Question 1

    15 May 2023 S1

    65
    What is the numerical difference in molar masses of second and third member of a homologous series?

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  2. Question 2

    26 Apr 2025 S1

    84
    What is the difference in molar mass of Undecane and Dodecane?

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  3. Question 3

    11 Apr 2026 S2

    13
    What is the difference in terms of molar masses of second and fourth members of homologous series?

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