Analysis of a sample of bromine in a mass spectrometer showed that it contained a mixture of the 79 Br and 81 Br isotopes in the proportions: 79 Br, 55.0%; 81 Br, 45.0%. Which of the following is the correct value for th e relative atomic mass of bromine to 3 significant figures?

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Analysis of a sample of bromine in a mass spectrometer showed that it contained a mixture of the ⁷⁹Br and ⁸¹Br isotopes in the proportions:

⁷⁹Br, 55.0%; ⁸¹Br, 45.0%.

Which of the following is the correct value for th

e relative atomic mass of bromine to 3 significant figures?

80.0

❌

79.8

❌

81.0

❌

79.9

✅

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