Analyze the mass spectrum graph. Calculate the average atomic mass of the unknown element:

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Question

Analyze the mass spectrum graph.
Calculate the average atomic mass of the unknown element:

10.2 amu

10.5 amu

10.8 amu

11.0 amu

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The relative atomic mass

= \frac{[{atomic mass of}^{10} X \times {abundance of}^{10} X] + [{atomicmassof}^{11} X \times {abundance of}^{11} X]}{{abundance of}^{10} X + {abundance of}^{11} X}

= \frac{[10 \times 80.1] + [11 \times 19.9]}{80.1 + 19.9} = 10.2 amu