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 Form 2 Chemistry Sample Revision Questions With Answers

An element B consists of three isotopes of mass, 28, 29 and 30 and percentage abundances of 92.2, 4.7 and 3.1 respectively. Show that the relative atomic mass of element is 28.11

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Answer Text:
RAM =92.2 𝑋 28+4.7 𝑋 29+3.1 𝑋 30100
=#(2581.6+136.3+93)/100 =2810.9/100 = 28.109#
≈ 28.11(Shown)


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