[wizrak]

Lets say there is a question:
There is a container containing 20g of hydrogen, caculate the number of moles of hydrogen in the container.

Hence depending on using 2 or 1 as Mr of hydrogen, we get different answer of 10 or 20 moles.

The thing I am confused about is that hydrogen exists as diatomic particle,

SO should I use 2 or 1 as the Mr of hydrogen when calculating its number of moles.

[Schrödinger]

Since hydrogen usually refers to the molecular version (diatomis), take the weight of Hydrogen (Hydrogen gas) to be 2 g/mol