# Problem: How long will it take for 80% of a 1.20mg sample of Rn-220 to decay? The half-life of Rn-220 is 55.6 seconds. A. 17.9 seconds B. 55.6 seconds C. 111 seconds D. 129 seconds E. 222 seconds

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###### Problem Details

How long will it take for 80% of a 1.20mg sample of Rn-220 to decay? The half-life of Rn-220 is 55.6 seconds.

A. 17.9 seconds

B. 55.6 seconds

C. 111 seconds

D. 129 seconds

E. 222 seconds

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Identifying Reaction Order concept. If you need more Identifying Reaction Order practice, you can also practice Identifying Reaction Order practice problems.

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Our tutors rated the difficulty ofHow long will it take for 80% of a 1.20mg sample of Rn-220 t...as high difficulty.

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Our expert Chemistry tutor, Ellen took 3 minutes and 41 seconds to solve this problem. You can follow their steps in the video explanation above.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Stackpool's class at Minnesota State University - Mankato.