The number of moles of ions present in one mole of unit cells of `NaCl`

The number of moles of nitrogen present in one litre of air containing 12% nitrogen by volume, under standard condition, is:

The number of moles of nitrogen present in one litre of air containing 15% nitrogen by volume, under standard condition, is:

The number of moles of nitrogen present in one litre of air containing 16% nitrogen by volume, under standard condition, is:

The number of moles of nitrogen present in one litre of air containing 17% nitrogen by volume, under standard condition, is:

The number of moles of nitrogen present in one litre of air containing 13% nitrogen by volume, under standard condition, is:

The number of moles of nitrogen present in one litre of air containing 14% nitrogen by volume, under standard condition, is:

The number of moles of nitrogen present in one litre of air containing 18% nitrogen by volume, under standard condition, is:

The number of moles of nitrogen present in one litre of air containing 19% nitrogen by volume, under standard condition, is:

The number of moles of nitrogen present in one litre of air containing 11% nitrogen by volume, under standard condition, is:

The number of moles of nitrogen present in one litre of air containing 20% nitrogen by volume, under standard condition, is: