What mass of Na is needed to react with H2O to liberate 566 L H2 gas at STP, accord-
ing to the equation below?
2 Na(s) + 2 H2O(l) → H2(g) +2 NaOH(aq)
Answer in units of g. Your answer must be
within 3.0%

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