The correct option is D 121.9 Average Atomic mass is given as: M_av=121×0.572+123×0.4281=121.856 gm/mol ...

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Stoichiometric Calculations

Antimony Sb i...

Question

Antimony (Sb) is $57.2$ % Sb- $121$ and $42.8$ % Sb- $123$ . Calculate the average atomic mass?

121.6

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120.8

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122.4

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121.9

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Solution

The correct option is D $121.9$
Average Atomic mass is given as:

$M_{a v} = \frac{121 \times 0.572 + 123 \times 0.428}{1} = 121.856 g m / m o l$

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