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Question

Calculate no. of atoms in 118g of water.

A
1.18×1025
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B
1.18×1024
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C
1.18×1022
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D
1.18×1026
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Solution

The correct option is A 1.18×1025

118 g water =11818 moles of water


(given massmolar mass=number of moles)=6.55 moles


1 mole has NA number of molecules.


14.75 moles=6.023×6.55×1023 molecules=39.484×1023 molecules


1 water molecule has 3 atoms.


118 g water has =39.484×3×1023


=118.45×1023 atoms


=1.18×1025 atoms


Hence, te correct option is A


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