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Question

Determine the number of molecules in water which has weight 50 gms.


A

16.7×1023

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B

4×1024

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C

5×1011

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D

4×1023

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Solution

The correct option is A

16.7×1023


1 mole of H2O has weight = 18 gms

18 g of H2O contains molecule of water =6.023×1023

50 gms of H2O contains molecules

=6.023×102318×50

=16.7×1023 molecules


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