AP Chem
posted by Nick .
Sulfuric acid (H2SO4) is a very strong diprotic acid. If 0.054 moles of sulfuric acid is mixed with water to make 667 milliliter of solution,what is the molarity of H+?
Answer in units of M
doing mole/liter doesn't work

Sure it does. But you must calculate and give what the problem asks you to calculate.
mols H2SO4 = 0.054/0.667 L = ?
mols H^+ = twice that.