Air with less than 19.5% oxygen cannot support human life. How many moles of oxygen would the caisson if the percent of oxygen in the air dropped to 19.4%.

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