H2 vs 2H and others

[raina_bandekar_1G]

Can someone explain the difference between H2 and 2H when looking at the number of moles? What about if you have Cl2 and 2H do both of these have 2 moles or does Cl2 have one and 2H have 2?

[305989798]

When dealing with moles, if you have H2 you have one mole of hydrogen gas, and within that one mole, you have two moles of hydrogen atoms. If you have 2H, you have two moles of hydrogen atoms, not bonded together as a molecule. If you have Cl2, you have one mole of chlorine gas, and within that one mole, you have two moles of chlorine atoms.

[Ai-Tan La 1K]

Cl2 means that there would be Cl bonded to Cl. So if you have one mol of Cl2 its 6.022x10^23 Cl-Cl molecules. H2 is the same thing. Its H bonded to H. 2H is different. 2H indicates that its two molecules of H but they are not bonded together.