Question

An element with mass 640 grams decays by 7.3% per minute. How much of the element is remaining after 8 minutes, to the nearest 10th of a gram?

Answer 1

Answer:

an element with mass 640 grams dacays by 7.3 per minut how

Answer 2

Answer:

The element remaining after 8 minutes of decay is 349 gm.

Step by step solution:

The number of element remaining is given as,

$N=N_0(\frac{100-r}{100})^t$

Here, r is the percentage of decay per minute and t is the time,

$N=640\text{ gm}\times(\frac{100-7.3}{100})^8\\=348.99\text { gm}\\\approx349\text{ gm}$