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Question

The number of molecules in 109.5 gm of HCl [H=1,Cl=35.5] is :

A
36.5×6.023×1023
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B
2×6.023×1023
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C
3.011×1023
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D
3×6.023×1023
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Solution

The correct option is D 3×6.023×1023
As we know, one mole of each substance contains NA molecules so 109.5g of HCl contains, 109.5×NA36.5=3NA=3×6.023×1023.

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