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scoray [572]
3 years ago
10

What is the total number of years that must pass before only 25.00 grams of an original 100.0-gram sample of C-14 remains unchan

ged?
(1) 2,865 y (3) 11,460 y
(2) 5,730 y (4) 17,190 y
Chemistry
2 answers:
Karolina [17]3 years ago
8 0
The answer is (3) 11,460 y. For this problem, you must know that the half life of C-14 is 5740 y and that nuclear decay processes are first order reactions (which means that the half life remains constant). For 25.00g to be left of a 100.0g sample, two half life must have elapsed (100*0.5*0.5=25). Each half life is 5730 y, so the total time elapsed is 5730 * 2 = 11,460 y.
REY [17]3 years ago
6 0

Answer:

The answer is 3; 11,460

Explanation:

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The given units are the units of masses which are interconvertable.

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For 4 oz:

28.349\frac{g}{oz} \times 4 oz = 113.396 g

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