In which case is the number of molecules of water maximum ?

1. 18 mL of water

2. 0.00224 L of water vapours at 1 atm and 273 K

3. 0.18 g of water

4. \(10^{-3}\) mol of water

Doubtly Asked 30 Oct 2026 NEET UG 2018 Practice test neet Save WhatsApp Report

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Answer: 1. 18 mL of water

Compare the number of moles; more moles means more molecules.

18 mL water = 18 g (density 1 g/mL) = 1 mol.
0.00224 L water vapour at STP = 0.0001 mol (note: at 1 atm and 273 K the gas volume of 22.4 L per mole applies).
0.18 g = 0.01 mol.
\(10^{-3}\) mol.

18 mL has the most molecules (\(6.02\times10^{23}\)).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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