LaurindaDelrosario LaurindaDelrosario

03-06-2015
Chemistry

Answered

What is the half-life of sodium-25 if 1.00 gram of a 16.00-gram sample of sodium-25 remains unchanged after 237 seconds?

(1) 47.4 s (3) 79.0 s

(2) 59.3 s (4) 118 s

Verified Answer :

rabinshrestha41 rabinshrestha41

03-06-2015

Given,
1 gram remain out of 16 grams after 237 seconds.

So,
1g -> 2g -> 4g -> 8g -> 16g
So, 4 half lives have taken palce.

So,
we divide 237 by 4 and we get our answer.

So,
234 / 4 = 59.25 ≈ 59.3

So, the answer is (2) 59.3 seconds

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