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Question

A balloon is filled with 15.5 g of water. What will be the number of water molecules contained in the balloon?


A
4.18×1023
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B
2.54×1023
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C
5.18×1023
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D
3.28×1023
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Solution

The correct option is C 5.18×1023
The molecular formula of water is H2O.
Molecular mass of water = 2 + 16 = 18 u.
So, gram molecular mass of water = 18g
Thus, 1 mole of water has a mass of 18 g and it contains 6.023×1023 molecules of water.

So, 15.5 g of water contains =(6.023×102318)×15.5
=5.18×1023 molecules

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