Given `t_(1//2)` = 3 hours, then how many gram of a substance will remain after 18 hours from 300 gram of a substance?

Options

A. 4.6 g
B. 5.6 g
C. 9.2 g
D. 6.4 g

Answer

A

Explanation

Number of half-lives = `(18)/(3) = 6`
Amount left after n half-lives=`([A_0])/(2^n)`
Thus, amount left `=(300)/(2^6)=4.6` g