Describe a experimental method to determine limiting molar conductivity of a NaOH aqueous solution at 298.15 K ​

Tin has ten stable isotopes. the heaviest, 124sn, makes up 5.80% of naturally occuring tin atoms. how many atoms of 124sn are present in 82.0 g of naturally occurring tin? what is the total mass of the 124sn atoms in this sample?

Find the mass, in grams, of 5.00*10^23 molecules of f2

In the experiment you asked to react hydrochloric acid and with sodium hydroxide. when measuring the volume of the reactants, which instrument would give the greatest precision.