Question

30 points Given 20g of a substance and has a half-life of 2hours, compute the decay constant, Kc of the substance per minute. Compute the amount of the substance left after 30minutes. If 40% of the original amount has decayed at a given certain time, how much remained? And lastly compute the time elapsed, in hour, to decay 40% of the initial amount.

          30 points
Given 20g of a substance and has a half-life
of 2hours, compute the decay constant, Kc of
the substance per minute. Compute the
amount of the substance left after 30minutes.
If 40% of the original amount has decayed at
a given certain time, how much remained? And
lastly compute the time elapsed, in hour, to
decay 40% of the initial amount.

30 points
Given 20g of a substance and has a half-life
of 2hours, compute the decay constant, Kc of
the substance per minute. Compute the
amount of the substance left after 30minutes.
If 40% of the original amount has decayed at
a given certain time, how much remained? And
lastly compute the time elapsed, in hour, to
decay 40% of the initial amount.

Added by Vicenta M.

Chemistry: Structure and Properties

Nivaldo Tro 2nd Edition

Instant Answer

Solved by Expert Snehal J

Step 1

To compute the decay constant, we can use the formula: Kc = ln(2) / t where ln(2) is the natural logarithm of 2 and t is the half-life of the substance. Given that the half-life is 2 hours, we need to convert it to minutes: t = 2 hours * 60 minutes/hour = 120 Show more…

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Please help me. 30 points. Given 20g of a substance and a half-life of 2 hours, compute the decay constant, Kc, of the substance per minute. Compute the amount of the substance left after 30 minutes. If 40% of the original amount has decayed at a certain time, how much remains? And lastly, compute the time elapsed, in hours, to decay 40% of the initial amount.