What is the concentration of K+ ion in solution, in mmol/L? Mass K2Cr2O7 = 2.4 g
Mass water = 310 g
Amount K2Cr2O7 = 8.2 × 10-3 mol
Molality = 0.026 mol/kg
Mole fraction K2Cr2O7 = 4.7 × 10-4
Concentration of K2Cr2O7 = 26 mmol/L

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