How many moles are in 0.850 grams

Need help on chemistry homework.

It's correct that you need to know the element first.

Divide the grams (0.850) by the Atomic Weight (g/Mol) to get number of moles.

Here's a coule of examples

Moles of H = .850 / 1.00794 g/mol = .843 mol

Moles of Fe = .850 g / 55.845 g/mol = .015 mol.

.850 grams of what?

you're missing something.

moles = grams/molecular weight

0.850 grams of what? Each element/compound is different.

That would be 0.84 mole. Well, in Hydrogen, however. That's what I learned.

Grams of what element? you can't solve unless you know what element to solve it for!