Question

plz answer fast..................​

Answer 1

1 g H2 because
Moles = given mass / molar mass
Also Moles = number of particles / Avogadro number
Therefore Number of particles = (given mass / molar mass ) * Avogadro number
In the above options only H2 has the number of molecules as Avogadro number / 2 . Maximum number of molecules in the above options is in 1 g of H2