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The two most abundant isotopes of boron are 10B and 11B, with 11B being about 4 times more abundant. In the mass spectrum of trimethyl borate [(CH3O)3B], ________.

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The relative atomic mass of Boron in trimethyl borate [(CH3O)3B] is; 10.8

Isotopes and Relative abundance

According to the question;

  • Since, ¹¹B is 4 times more abundant than ¹⁰B;

The relative abundance of Boron in the spectrum is;

Relative atomic mass = (80% of 11) + (20% of 10)

  • RAM = 8.8 + 2

  • RAM = 10.8

Hence, the relative atomic mass of Boron in trimethyl borate [(CH3O)3B] is; 10.8

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