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You are watching: There are two naturally occurring isotopes of gallium
allow x = the portion that has actually a massive of 70.925,
then (1-x) = fraction that has actually a fixed of 68.926.
The amount of the 2 fractions times their masses will equation the typical atomic massive which is provided as 69.70
In equation kind this is:
70.925 * x +...
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Let x = the fraction that has actually a fixed of 70.925,
then (1-x) = portion that has actually a fixed of 68.926.
The sum of the two fractions times your masses will certainly equation the mean atomic mass which is provided as 69.70
In equation form this is:
70.925 * x + 68.926 * (1-x) = 69.70
Solve because that x:
70.925x + 68.926 - 68.926x = 69.70
1.99 x = 1.225
x = .6156
decimal portion times 100 = %
.6156 * 100 = 61.56%, therefore 61.56% is Ga-70.92 and also 38.44% is Ga-68.93.
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The two aspects with your mass numbers being:
Ga-71 and also Ga-69
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