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WAEC Chemistry 2024 Paper

Question : 20

Total: 50

^{10}

^{11}

B. The relative atomic mass of Boron is

Solution:

Concept:

The relative atomic mass is the weighted average of the masses of an element's naturally occurring isotopes.

Explanation:

Boron consists of

19.9\%

^{10}\mathrm{B}

and

80.1\%

^{11}\mathrm{B}

So, relative atomic mass =

\left(\frac{19.9}{100} \times 10\right) + \left(\frac{80.1}{100} \times 11\right)

\Rightarrow (0.199 \times 10) + (0.801 \times 11)

\Rightarrow 1.99 + 8.811

\Rightarrow 10.801

Hence, the relative atomic mass of Boron is approximately

10.8

Answer:

10.8

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