N2 + 3H2 → 2NH3 How many moles of hydrogen, H2, are needed to react with 3.5 moles of nitrogen, N2?

Covalent bonds generally form when the bonded elements have a difference in electronegativity less than 1.5. subtract the electronegativities for the following pairs of elements and predict whether they form a covalent bond. electronegativity difference of c and c: ionic covalent electronegativity difference of mg and cl: ionic covalent