The atomic masses of the two stable isotopes of boron; boron-10 (natural abundance: 19.78%) and boron-11 (natural abundance: 80.22%) are 10.0129 amu and 11.0093 amu, respectively.  calculate the average atomic mass of boron   10.41 amu 10.95 amu 10.81 amu  10.72 amu  10.13 amu

10.41 amu is the answer the first one this is the two stable isotopes

the electrical  conductivity  of asolution  of an electrolyte is measured by determining the resistance of thesolution  between two flat or cylindrical electrodes separated by a fixed distance.

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