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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

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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.