Question

calculate the number of molecules present in 16g CH4

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Answer 1

Answer:

NA or 6.023x10^23

Explanation:

moles =gm/molecular weight

          =16/16              (molecular weight of CH4 =12+4)

          =1 mole   -eqn 1

also mole=no. of molecules /NA  -eqn2     (NA is avogadro no. whose value is      

                                                                                  6.023x10^23)

 from eqn1  and eqn 2

 we get  1 = no. of molecules/6.023x10^23    

               so, no of molecules =NA or 6.023x10^23              

Answer 2

Explanation:

no of moles =givenmass/molar mass=no of molecule/avagadro no.

no of moles =16g/16=1

1= no of molecule/avagadro no.

so,ans is 1avagadro. no