Conversion of Moles.

You would have to find the molar mass, then if the problem said,"What is grams?" Look at the equation, and if it says some thing like this
2.45 mol H2.
You would have to find the molar mass then,multiply the molar mass and 2.45 or whatever the number is. This is how you find the mass

The same goes if it asks for the mole.  you just need to find the molar mass and divide that by the number given. You would get the mole.

That is how you covert moles to grams and grams to moles.
As for volume and particles (atoms,etc.) There is an easy way.

Click here for the easy way.


Hope it helps!