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In which case is number of molecules of water maximum?

1. 18 mL of water
2. 0.18 g of water
3. 10⁻³ mol of water
4. 0.00224 L of water vapours at 1 atm and 273 K

Correct answer: 18 mL of water

Solution

To determine the number of molecules, we calculate moles for each case. 18 mL of water corresponds to 1 mole (18 g), which contains the maximum number of molecules (6.022 × 10²³). Other options yield fewer moles.

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