A radioactive substance has a half-life of 3 days. If a mass of 1.55g of this substance is left after decaying for 15 days, determine the original value of the mass.

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A. 49.6g
B. 37.2g
C. 24.8g
D. 12.4g

Correct Answer: Option A

A. 49.6g

Explanation

1→1/2→1/4→1/8→1/16→1/32

1/32=1.55g

1 = 1.55 x 32

=49.6g

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