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Question

The number of moles in 19.86 g of Pb(NO3)2 (Molecular Weight =207.2 g/mole) equals

A
0.06 moles
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B
6.023 moles
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C
0.6 moles
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D
0.12 moles
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Solution

The correct option is A 0.06 moles
As we know, one mole of each substance contains NA=6.023×1023 molecules/atoms.

Here, moles of Pb(NO3)2=19.86331.2=0.06 moles

Therefore, the number of molecules of
Pb(NO3)2=0.06×6.023×1023

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