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An element with mass 310 grams decays by 5.7% per minute. How much of the element is remaining after 9 minutes, to the nearest 10th of a gram?
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An element with mass 310 grams decays by 5.7% per minute. How much of the element is remaining after 9 minutes, to the nearest 10th of a gram?

User Surz
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2 Answers

3 votes

Answer:

182.8

Explanation:

An element with mass 310 grams decays by 5.7% per minute. How much of the element-example-1
User Prabowo Murti
by
8.2k points
6 votes
1st
I need to find out what percentage is left after 1 minute
100 - 5.7 = 94.3% (0.943)

2nd plug into the formula
A = A_(0) r^(t)

A0 = 310
r = 0.943
t = 9


A = 310(0.943)^(9) \\ A = 310(0.58966) \\ A = 182.8 g
User Jim Snyder
by
8.8k points
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