Thomson's plum pudding model dictated that the atom contains negative charges surrounded by positive charges in close vicinity. Rutherford's experiment determined that the particles are not this close and the atom consists mainly of empty space and that it is the negative charge that surrounds the positive charge, not the other way around.
The mass defect in amu/atom is 11.928.
The mass defect is the discrepancy between the nucleus of an atom's anticipated mass and its actual mass. This discrepancy is due to the binding energy of a system, which might manifest as excess mass.
The nucleus must be robustly spherical as expected for a doubly magical nucleus because the stripped neutron fell into a distinct orbital shell above the closed inner shells of tin-132 after the researchers examined the energy and angular distribution of the particles.
Mass of atom = 131.917760 amu
Mass of proton = 1.007825 amu
Mass of neutron = 1.008665 amu
Sn atom has 50 protons and 69 neutrons.
Mass defect = Mp + Mn - MA
= 50 × 1.007825 + 69 × 1.008665 - 131.917760
= 50.39125 + 69.597885 - 131.917760
= 11.928 amu/atom
Therefore, the mass defect in amu/atom is 11.928.
Learn more about mass defects here:
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Net overall dissociation:
Na2CO3 ---> 2Na(-) + CO3(2-)
*The ion charge is in parenthesis
I'm not completely sure but i think it's H2O. hope this helps :)
Due to the lone pair of electron present on nitrogen in ethylamine, 
it will behave as base and attack on the hydrogen of hydroxy group of acetic acid, 
which is an acid and results in the formation of conjugate acid of triethyl amine and conjugate base of acetic acid.
The reaction between triethylamine and acetic acid is shown in the attached image.
