. The number of water molecules is maximum in


(a) 1.8gram of water

(b) 18 gram of water

(c) 18 moles of water

(d) 18 molecules of water.

Best Answer

Correct Option Is : (c)

Explanation :

Number of molecules in 1.8 gram of water =given mass / molar mass × avogadro's number= 6.023×1023 / 18×1.8

=6.023×1022 molecules.

Number of molecules in 18 gram of water =1mole= 6.023×1023 molecules

Number of molecules in 18 moles of water =18×6.023×1023 molecules

So, maximum number of molecules are present in 18 moles of water

Therefore, the correct answer is option 3.

 

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