Imagine you emptied a 1.000 dm3 water bottle of marked water molecules into the sea and then allowed sufficient time for all the molecules to disperse throughout the oceans and seas. What is the probability that you could catch one of the original marked water molecules if you refilled the same water bottle with water from the ocean?

The probability that you could catch one of the original marked water molecules if you refilled the same water bottle with water from the ocean is ZERO.

Explanation:

The oceans take thousands of years to mix and on top, the water is continuously being subducted deep into the planet by tectonic action.

So by the time your marked water molecule is well mixed, some of it is lost to geological processes and your chances of catching original marked water becomes zero.

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error

1.43 x 10^-11 j the guy commented the awnser just making sure u see it .