The half-life of ⁴²K is 12.5 h.How much will remain after 87 h if the original sample contained 256 g of ⁴²K?

Question

Quizplus · Accepted Answer

To find the remaining amount of a substance after a certain time given its half-life, you can use the formula: remaining amount = original amount * (1/2)^(time/half-life). For ⁴²K with a half-life of 12.5 hours, after 87 hours, the remaining amount = 256 * (1/2)^(87/12.5) ≈ 2.1 g.

The Half-Life of 42K Is 12

The Half-Life of ⁴²K Is 12