If N is Avogadro's number, the number of molecules in 6 g of hydrogen at NTP is
We know that
Number of moles =
massMolarmass
Mass=6grams
Molarmassofhydrogen=2
Hencenumberofmoles=62=3moles
Numberofmolecules=Numberofmoles×Avogadro′sNumber(N)
Numberofmolecules=3×N
Hencenumberofmolecules=3N