1 mole ----------- 6.02 x 10²³ molecules
? mole ---------- 8.22 x 10²⁴ molecules
moles of H₂ = ( 8.22 x 10²⁴ ) x 1 / 6.02 x 10²³
= 13.654 moles of H₂
Mass of H₂ :
Molar mass H₂ = 2.0 g/mol
moles of H₂ x molar mass H₂
( 13.654 ) x ( 2.0 ) = 27.308 g
hope this helps!
