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13 October, 05:22

The table shows the decay in a 59 g sample of bismuth 212 overtime.

if bismuth 212 has a half-life of 60.5 seconds, how many grams of the sample will be left after 121 seconds?

A. 3.69 g

B. 7.38 g

C. 14.75 g

D. 29.5 g

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Answers (1)
  1. 13 October, 05:38
    0
    Answer: C

    14.75g

    Explanation:

    Given that the half life time = 60.5s

    Let No = initial mass = 59g

    N = decayed mass

    At time t = 0, No = 59g

    At time t = 60.5s,

    N = No/2 = 59/2

    = 29.5g

    At time t = 121

    N = 29.5/2 = 14.75g

    Therefore N = 14.75g
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