Question

Is there a difference between 1 gram H2 and 1 gram H ? If yes, why?

Answer 1

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1 gram of H is one mole of Hydrogen atom

But, in H₂ there are 2 atoms, so, there will be 0.5 moles of this gas

The diatomic H₂ gas is heavier (one mole weighs 2 g) than the monoatomic H gas (one mole weighs 1 g)