One mole of `He^(o+)` ions is excited .An analysis showed that `50%` of ions are in the third energy level `25%` are in the second energy level and the remaining are in the first energy level .Calculate the energy emitted in kilojoules when all the ions return to the ground state

Explanation

To solve the problem, we need to calculate the energy emitted when one mole of `He^(0+)` ions return to their ground state from the excited states. The given distribution of ions in energy levels is as follows:

- 50% in the 3rd energy level (n=3)
- 25% in the 2nd energy level (n=2)
- 25% in the 1st energy level (n=1, ground state)

### Step 1: Determine the number of ions in each energy level
Since we have one mole of `He^(0+)` ions, the total number of ions is equal to Avogadro's number (NA = 6.022 × 10²³).
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