NEET 2018 · ChemistryPrevious Year Question

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

Answer: (C) 18 mL of water. \textbf{Answer:} (C) 18 mL of water \textbf{Solution:} Convert each to moles (molecules $= n N_{A}$ ): A.

A.0.00224 L of water vapour at 1 atm and 273 K
B.0.18 g of water
C.18 mL of water✓
D. $1 0^{- 3}$ mol of water

Correct Answer

Solution & Explanation

\textbf{Answer:} (C) 18 mL of water \textbf{Solution:} Convert each to moles (molecules $= n N_{A}$ ): A. $\frac{0.00224}{22.4} = 1 0^{- 4}$ mol B. $\frac{0.18}{18} = 1 0^{- 2}$ mol C. $18$ mL $\times 1$ g mL $^{- 1} = 18$ g $= \frac{18}{18} = 1$ mol (largest) D. $1 0^{- 3}$ mol 18 mL of water has the most molecules.

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