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13 February, 19:06

How much nitrogen-13 would be left after 40 minutes if the sample started at 4g

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  1. 13 February, 19:26
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    0.248 g

    Explanation:

    We are given;

    Time as 40 minutes Original amount of N-13

    We are required to calculate the amount left after decay.

    We need to know the half life of N-13 first; Half life of N-13 is 9 minutes 58 seconds (9.965 minutes0

    We are going to use the formula;

    Remaining amount = Original amount * 0.5^n

    That is; N = N₀ * 0.5^n, where n is the number of half lives.

    n = 40 minutes : 9.965 minutes

    = 4.014

    Therefore;

    N = 4 g * 0.5^4.014

    = 0.248 g

    Therefore, the mass of Nitrogen-13 that will be left is 0.248 g
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