Question

no. of moles and molecules in 19.86g of Pb(NO3)2

Answer 1

The number of moles and molecules in 19.86 gram of Pb(NO3)2. (Pb=207,N=14,O16) No. of moles is equal to given weight divided by molecular weight.

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Answer 2

No. Of moles = given weight / mole.Weight

=> 19.86 / 331

=> 0.06

And

No. Of molecules=avagadro no. X no. Of moles

=> 6.023 x 10 ^23 x 0.06

=> 0.36138 × 10^23

=> 3.6138 × 10^22