Final answer:
The number of uranium atoms present per hour in a nuclear reactor can be calculated by dividing the energy delivered by the reactor by the energy released per nucleus of a uranium atom.
Step-by-step explanation:
The energy released due to the fusion of each nucleus of a uranium atom is 170 ml. If the atomic power of a nuclear reactor can deliver 300 ml of energy, we can calculate the number of uranium atoms present per hour using the equation:
Number of uranium atoms = Energy delivered by the nuclear reactor / Energy released per nucleus of a uranium atom
Substituting the given values into the equation:
Number of uranium atoms = 300 ml / 170 ml
Number of uranium atoms = 1.76
Therefore, the number of uranium atoms present per hour is approximately 1.76.