I'm taking a course in chemistry and I need some help, I have some questions : 1.Why do ions, strong acids,bases etc. conduct electricity well ? 2.In the periodic table, are the masses of atoms in amu or grams? what's the difference? and why is Carbon 14 the standard ? why do we need a standard in first place, in other words why can't we just measure the mass without relating to carbon 14 ? 3. find the molarity of each ion in 0.50M Co(NO3)2. So we put the equation: Co(NO3)2 --> Co2+ +2NO3- Co2+ = 0.50M NO3- = 1.0M ----------- My question is why did we multiply with the coefficient? how is it that by multiplying the coefficients with concentration we immediately get the answer? I just can't find the logic here. Thanks.