(3.) 5.0 mg of radioactive nobelium-253 was removed from the reactor to be used in an experiment. It took 291 seconds (just under 5 minutes) to get the sample from the reactor to the laboratory. How many milligrams of nobelium-253 remained upon arrival to the laboratory? The half-life of nobelium-253 is 97 seconds.

Complete Question

The complete question is shown on the first uploaded image

The partial pressure is

Explanation:

The Partial pressure of is mathematically represented as

Where is the total pressure of water with a value of 15.5 mm of Hg

            is the partial pressure of water with a value 753 mm of Hg

Now substituting values