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The relative abundance of two isotopes of an element with atomic weight 85 and 87 is 75% and 25% respectively. Then calculate the average atomic weight of element.

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86.0

85.5

75.5

40.0

answer is B.

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Detailed Solution

Average atomic weight of element $= \frac{85 \times 3 + 87 \times 1}{3 + 1} = 85.5$

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