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The half-life of gallium-67 is 78.2 hours If you begin with 87.6 milligrams of gallium-67 how many milligrams will you have left after 312.8 hours have passed?
Wiki User
∙ 14y ago
If you do the division - 312.8 hours / 78.2 hours - you see that 312.8 hours is 4 times the half-life. So, you simply divide the original amount by 2, repeating 4 times: 87.6 / 2 / 2 / 2 / 2.
Wiki User
∙ 14y ago
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