Question

Gallium has occurring isotopes of mass numbers 69 and 71 respectively. what's the percentage abundance on both isotopes, having their relative atomic equal to 70.5 line AMU

Answer 1

Answer:

average of their atomic mass

Explanation:

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Answer 2

Answer:

25% and 75%

Explanation:

Let the % abundance of one of the isotopes be x

Other isotope abundance will be (100-x)

According to average atomic mass formula,

(69x + 71(100-x)) / 100 = 70.5

69x + 7100 - 71x = 7050

2x = 50

X = 25

Therefore one has 25%abundance

Other isotope has (100-25)% = 75% abundance