[化學] 核化學蛻變

[howhowhow (像我愛你一樣,愛著我好嗎)]

A 100 gram sample of pure 37Ar decays by electron capture with a half-life of
                          18

35 days. How long will it take for 90 grams of 37Cl to accumulate?
                                               17
A)31 B)39 C)78 D)116 E)315

我用一級反應去算

N/No=(1/2)^t/t(half-life)

N=10g
No=100g
t(half-life)=35 days
算出來是116.26

答案是D 不知道對嗎?

麻煩高手解答一下!謝謝! <(_ _)>

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